Anp II Final Exam: Trivia Quiz!

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  • 1/85 Questions

    This occurs when water loss is greater than water gain.

    • Dehydration
    • Evaporation
    • Precipitation
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About This Quiz

What do you know about ANP? Do you want to be able to pass this quiz? The effects of ANP and angiotensin II alone and urinary electrolyte and water excretion were studied in people who were experiencing maximal water diuresis. ANP caused a significant increase in urine flow and sodium excretion. If you want to see what you know about Anp II, this quiz can help.

Endocrinology Quizzes & Trivia

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  • 2. 

    This structure prevents food or water from entering the trachea.

    • Arytenoid cartilage

    • Epiglottis

    • Nasopharynx

    Correct Answer
    A. Epiglottis
    Explanation
    The epiglottis is a flap of cartilage located at the base of the tongue that covers the opening of the trachea during swallowing. Its main function is to prevent food or water from entering the trachea and instead direct it towards the esophagus. This helps to ensure that the airway remains clear and that food and liquid are directed towards the digestive system. The arytenoid cartilage and nasopharynx do not have the same function as the epiglottis in preventing food or water from entering the trachea.

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  • 3. 

    Which of the following is a waste product normally excreted by the kidneys?

    • Urea

    • Glucose

    • Insulin

    Correct Answer
    A. Urea
    Explanation
    Urea is a waste product normally excreted by the kidneys. It is formed in the liver as a result of the breakdown of proteins and is then transported to the kidneys for excretion. The kidneys filter urea from the blood and eliminate it through urine. Glucose is not a waste product but a type of sugar used by the body for energy. Insulin is a hormone produced by the pancreas to regulate blood sugar levels and is not excreted by the kidneys.

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  • 4. 

    An analysis of the physical, chemical and microscopic properties of urine is called:

    • Urinalysis

    • Filtration study

    • Concentration study

    Correct Answer
    A. Urinalysis
    Explanation
    Urinalysis refers to the examination and evaluation of the physical, chemical, and microscopic properties of urine. It involves analyzing the color, odor, pH level, specific gravity, and presence of various substances such as glucose, protein, red and white blood cells, bacteria, and crystals. This comprehensive assessment helps in diagnosing and monitoring various medical conditions like urinary tract infections, kidney diseases, diabetes, and dehydration. Therefore, urinalysis is the correct term for the analysis of urine properties.

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  • 5. 

    These are cells of the alveoli that produce surfactant.

    • Type I alveolar cells

    • Type II alveolar cells

    • Type III alveolar cells

    Correct Answer
    A. Type II alveolar cells
    Explanation
    Type II alveolar cells are responsible for producing surfactant, a substance that helps to reduce surface tension in the alveoli. This surfactant is important for preventing the collapse of the alveoli during exhalation and for maintaining the elasticity of the lungs. Type I alveolar cells, on the other hand, are involved in gas exchange, while Type III alveolar cells are not a recognized type of alveolar cell. Therefore, Type II alveolar cells are the correct answer as they specifically produce surfactant.

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  • 6. 

    This is the primary gas exchange site.

    • Bronchiole

    • Nasal sinuses

    • Alveolus

    Correct Answer
    A. Alveolus
    Explanation
    The alveolus is the primary gas exchange site in the respiratory system. It is a tiny air sac located at the end of the bronchioles in the lungs. The walls of the alveoli are thin and surrounded by a network of blood vessels. This allows for efficient exchange of oxygen and carbon dioxide between the air in the alveoli and the bloodstream. The large surface area and close proximity to capillaries make the alveoli ideal for the diffusion of gases.

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  • 7. 

    In an intracellular fluid the most abundant cation is:

    • Na+

    • Cl-

    • K+

    Correct Answer
    A. K+
    Explanation
    In an intracellular fluid, the most abundant cation is K+. Cations are positively charged ions, and potassium (K+) is the most abundant cation inside cells. This is because the cell membrane contains ion channels and pumps that actively transport potassium ions into the cell and maintain a higher concentration of K+ inside compared to the extracellular fluid. Sodium (Na+) and chloride (Cl-) are also important ions in intracellular fluid, but they are not as abundant as K+.

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  • 8. 

    Which is not a major function of the kidney?

    • Regulation of blood ionic composition

    • regulation of blood cell size

    • regulation of blood volume

    Correct Answer
    A. regulation of blood cell size
    Explanation
    The kidney is responsible for regulating the blood's ionic composition and volume. It filters waste products and excess ions from the blood, maintaining the balance of electrolytes in the body. However, the kidney does not play a major role in regulating blood cell size. This function is primarily controlled by the bone marrow, where red blood cells are produced and regulated. Therefore, regulation of blood cell size is not a major function of the kidney.

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  • 9. 

    This is a condition where blood pH is below 7.35.

    • Isodosis

    • Acidosis

    • Alkalosis

    Correct Answer
    A. Acidosis
    Explanation
    Acidosis is a condition characterized by a blood pH below 7.35. In this condition, there is an excess of acid or a decrease in bicarbonate levels in the blood, leading to an imbalance in the body's acid-base equilibrium. This can be caused by various factors such as respiratory or metabolic disorders. Acidosis can have detrimental effects on the body's normal functioning and may require medical intervention to restore the pH balance.

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  • 10. 

    Which is the correct order of filtrate flow?

    • Glomerular capsule, Proximal Convoluted tubule (PCT), Loop of Henle, Distal Convoluted tubule (DCT), Collecting duct

    • Loop of Henle, glomerular capsule, PCT, DCT, Collecting duct

    • Ascending limb of Loop, PCT, DCT, Collecting duct

    Correct Answer
    A. Glomerular capsule, Proximal Convoluted tubule (PCT), Loop of Henle, Distal Convoluted tubule (DCT), Collecting duct
    Explanation
    The correct order of filtrate flow starts with the glomerular capsule, where the initial filtration of blood occurs. The filtrate then moves into the Proximal Convoluted Tubule (PCT), where reabsorption of water, ions, and nutrients takes place. Next, the filtrate enters the Loop of Henle, which is responsible for establishing a concentration gradient in the kidney. After the Loop of Henle, the filtrate moves into the Distal Convoluted Tubule (DCT), where further reabsorption and secretion occur. Finally, the filtrate enters the Collecting Duct, which plays a role in the final concentration of urine.

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  • 11. 

    This is the formation of a new glucose molecule.

    • Glycolysis

    • Gluconeogenesis

    • Glucosamine

    Correct Answer
    A. Gluconeogenesis
    Explanation
    Gluconeogenesis is the process of synthesizing glucose from non-carbohydrate sources, such as amino acids and glycerol. This process occurs mainly in the liver and kidneys when glucose levels are low, such as during fasting or intense exercise. In gluconeogenesis, new glucose molecules are formed to maintain blood sugar levels and provide energy to the body. Glycolysis, on the other hand, is the breakdown of glucose to produce energy. Glucosamine is a compound involved in the synthesis of proteins and other molecules, but it is not directly related to the formation of glucose.

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  • 12. 

    Increased secretion of Hydrogen ions would result in a ______________ of blood ____________?

    • Increase, sodium levels

    • Decrease, pH

    • Increase, urea

    Correct Answer
    A. Decrease, pH
    Explanation
    Increased secretion of Hydrogen ions would result in a decrease in blood pH. Hydrogen ions are acidic, so an increase in their secretion would make the blood more acidic, leading to a decrease in pH.

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  • 13. 

    The major hormone that regulates water loss is:

    • Renin

    • ADH

    • Angiotensin

    Correct Answer
    A. ADH
    Explanation
    ADH, or antidiuretic hormone, is the major hormone that regulates water loss in the body. It is produced by the hypothalamus and released by the pituitary gland. ADH acts on the kidneys, specifically the collecting ducts, to increase water reabsorption and decrease urine production. This helps to conserve water in the body and prevent excessive water loss. Renin and angiotensin are involved in the regulation of blood pressure and not specifically water loss.

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  • 14. 

    In an extracellular fluid the most abundant cation is:

    • Na+

    • Cl-

    • K+

    Correct Answer
    A. Na+
    Explanation
    In an extracellular fluid, the most abundant cation is Na+. This is because Na+ plays a crucial role in maintaining the balance of fluids in the body and is involved in various physiological processes such as nerve transmission, muscle contraction, and regulation of blood pressure. Additionally, Na+ is the main cation found in the blood plasma and interstitial fluid, making it the most abundant cation in the extracellular fluid.

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  • 15. 

    This is the structure of the nephron that filters blood.

    • Glomerular capsule

    • Loop of Henle

    • Ascending limb

    Correct Answer
    A. Glomerular capsule
    Explanation
    The glomerular capsule is the structure in the nephron that filters blood. It is responsible for the initial filtration of blood, where waste products, excess ions, and water are removed from the blood and enter the nephron for further processing. The glomerular capsule surrounds the glomerulus, a network of capillaries, and helps to capture and collect the filtrate from the blood. This filtrate will then pass through the rest of the nephron, including the loop of Henle and the ascending limb, for reabsorption and secretion processes before being excreted as urine.

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  • 16. 

    This transports urine from the kidney to the bladder.

    • Urethra

    • Ureter

    • Descending loop of Henle

    Correct Answer
    A. Ureter
    Explanation
    The ureter is the correct answer because it is the tube that carries urine from the kidney to the bladder. The urethra, on the other hand, carries urine from the bladder out of the body. The descending loop of Henle is a part of the nephron in the kidney and is responsible for reabsorbing water and electrolytes.

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  • 17. 

    The Na+ level in blood is controlled by:

    • Aldosterone

    • Insulin

    • ATP production

    Correct Answer
    A. Aldosterone
    Explanation
    Aldosterone is a hormone produced by the adrenal glands that helps regulate the levels of sodium and potassium in the blood. It acts on the kidneys to increase the reabsorption of sodium, which in turn helps to increase the blood sodium levels. Therefore, aldosterone plays a crucial role in controlling the Na+ level in blood. Insulin is primarily involved in regulating blood sugar levels, while ATP production is the process by which cells generate energy and is not directly involved in controlling sodium levels in the blood.

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  • 18. 

    PTH, ,calcitriol and calcitonin are:

    • The main regulators of magnesium in the blood

    • The main regulators of phosphate in the blood

    • The main regulators of calcium in the blood

    Correct Answer
    A. The main regulators of calcium in the blood
    Explanation
    PTH (parathyroid hormone), calcitriol, and calcitonin are hormones that play a crucial role in regulating calcium levels in the blood. PTH is released by the parathyroid glands in response to low levels of calcium and acts to increase calcium levels by stimulating the release of calcium from bones, enhancing calcium absorption in the intestines, and reducing calcium excretion in the kidneys. Calcitriol, the active form of vitamin D, also promotes calcium absorption in the intestines. Calcitonin, on the other hand, is released by the thyroid gland in response to high levels of calcium and helps to lower calcium levels by inhibiting its release from bones. Together, these hormones maintain the balance of calcium in the blood.

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  • 19. 

    This term means the entry of substances into the body from the filtrate.

    • Reabsorption

    • filtration

    • Secretion

    Correct Answer
    A. Reabsorption
    Explanation
    Reabsorption refers to the process of substances being taken back into the body from the filtrate. This suggests that the substances are being reabsorbed and returned to the bloodstream.

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  • 20. 

    Which of the following is used to promote water reabsorption by the kidneys?

    • Antidiuretic hormone

    • ANP

    • Aldosterone

    Correct Answer
    A. Antidiuretic hormone
    Explanation
    Antidiuretic hormone is used to promote water reabsorption by the kidneys. It does this by increasing the permeability of the collecting ducts in the kidneys, allowing more water to be reabsorbed back into the bloodstream. This helps to conserve water and prevent excessive water loss through urine.

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  • 21. 

    Which of the following is a function of an electrolyte in the body?

    • Carry electrical currents

    • Serve as cofactors

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Electrolytes in the body serve multiple functions. They help carry electrical currents, which is essential for nerve impulses and muscle contractions. Additionally, electrolytes serve as cofactors, assisting in various enzymatic reactions in the body. Therefore, the correct answer is "All of the above."

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  • 22. 

    The point where the trachea divides into right and left primary bronchi is a ridge called

    • Carina

    • Secondary bronchioles

    • Parietal pleura

    Correct Answer
    A. Carina
    Explanation
    The correct answer is Carina. The carina is a ridge located at the point where the trachea divides into the right and left primary bronchi. It is an important landmark in the respiratory system and serves as a reference point for various procedures and examinations. The carina plays a crucial role in ensuring the proper distribution of air to the lungs and is also involved in the cough reflex.

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  • 23. 

    This is the direction of diffusion of gases at the alveoli of the lungs.

    • Oxygen into blood , Carbon dioxide into blood

    • Oxygen out of blood , Carbon dioxide into blood

    • Oxygen into blood , Carbon dioxide out of blood

    Correct Answer
    A. Oxygen into blood , Carbon dioxide out of blood
    Explanation
    During respiration, oxygen diffuses from the alveoli of the lungs into the bloodstream. This is because the concentration of oxygen is higher in the alveoli than in the blood. On the other hand, carbon dioxide, which is a waste product of cellular respiration, diffuses from the bloodstream into the alveoli. This is because the concentration of carbon dioxide is higher in the blood than in the alveoli. Therefore, the correct answer is "Oxygen into blood, Carbon dioxide out of blood."

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  • 24. 

    This is when a substance passes from the fluid in the tubular lumen through the apical membrane then across the cytosol into the interstitial fluid.

    • Paracellular reabsoprtion

    • Transcellular reabsoprtion

    • Apical reasborption

    Correct Answer
    A. Transcellular reabsoprtion
    Explanation
    Transcellular reabsorption refers to the process in which a substance passes from the fluid in the tubular lumen through the apical membrane, across the cytosol, and into the interstitial fluid. This involves the substance crossing both the apical and basolateral membranes of the epithelial cells lining the tubules. Paracellular reabsorption, on the other hand, occurs when a substance passes between adjacent cells through the tight junctions. Apical reabsorption specifically refers to the movement of a substance across the apical membrane only. Therefore, the correct answer is transcellular reabsorption.

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  • 25. 

    Which of the following is not part of the upper respiratory system?

    • Pharynx

    • Trachea

    • Nasal meatuses

    Correct Answer
    A. Trachea
    Explanation
    The trachea is not part of the upper respiratory system. The upper respiratory system consists of the nasal cavity, pharynx, and larynx, while the trachea is part of the lower respiratory system. The trachea connects the larynx to the bronchi and allows air to pass in and out of the lungs.

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  • 26. 

    In extracellular fluid the most abundant anion is:

    • Na+

    • Cl-

    • K+

    Correct Answer
    A. Cl-
    Explanation
    In extracellular fluid, the most abundant anion is chloride (Cl-). This is because chloride ions are highly soluble in water and are present in high concentrations in the extracellular fluid. They play a crucial role in maintaining the balance of fluids and electrolytes in the body. Sodium (Na+) and potassium (K+) are also present in extracellular fluid, but chloride ions are more abundant.

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  • 27. 

    This is the largest single component of the human body.

    • Skin

    • Water

    • Blood

    Correct Answer
    A. Water
    Explanation
    Water is the largest single component of the human body because it makes up about 60% of our total body weight. It is essential for various bodily functions such as regulating body temperature, transporting nutrients and oxygen, lubricating joints, and removing waste products. Additionally, water is present in every cell, tissue, and organ of the body, making it a vital component for overall health and well-being.

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  • 28. 

    Water intoxication results from:

    • Osmosis of water from ICF to ECF

    • Dilute body fluids and a decrease in the osmolarity of interstitial fluids

    • Decrease in water intake

    Correct Answer
    A. Dilute body fluids and a decrease in the osmolarity of interstitial fluids
    Explanation
    Water intoxication occurs when there is a dilution of body fluids and a decrease in the osmolarity of interstitial fluids. This means that the concentration of solutes in the body's fluids becomes too low, leading to an imbalance in the body's electrolytes. This can happen when a person consumes excessive amounts of water, overwhelming the body's ability to excrete it. As a result, the excess water enters the cells, causing them to swell and potentially leading to serious health complications.

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  • 29. 

    This is the most common cause of metabolic alkalosis.

    • Hemorrhage

    • Vomiting

    • Pneumothroax

    Correct Answer
    A. Vomiting
    Explanation
    Vomiting is the most common cause of metabolic alkalosis because when a person vomits, they lose stomach acid which is acidic. This loss of acid leads to an increase in the pH of the blood, resulting in alkalosis. Hemorrhage and pneumothorax do not directly cause metabolic alkalosis.

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  • 30. 

    Which of the following is a passageway for air, food and water?

    • Pharynx

    • Larynx

    • Paranasal sinuses

    Correct Answer
    A. Pharynx
    Explanation
    The pharynx is a passageway for air, food, and water. It is located behind the nasal cavity, mouth, and larynx. It serves as a common pathway for both the respiratory and digestive systems. Air passes through the pharynx when we breathe, while food and water pass through it when we swallow. The pharynx plays a crucial role in ensuring that air and food are directed to their respective pathways, preventing choking or aspiration. The larynx, on the other hand, is primarily responsible for producing sound and protecting the airway during swallowing. Paranasal sinuses are air-filled spaces in the skull that help with voice resonance and reducing the weight of the skull.

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  • 31. 

    This is the smooth dense irregular connective tissue that is continuous with the outer coat of the ureter.

    • Adipose capsule

    • Renal capsule

    • Renal hilus

    Correct Answer
    A. Renal capsule
    Explanation
    The renal capsule is the smooth dense irregular connective tissue that surrounds the kidney. It is continuous with the outer coat of the ureter, which is the tube that connects the kidney to the bladder. The renal capsule provides protection and support to the kidney, helping to maintain its shape and structure.

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  • 32. 

    The portion of the kidney that extends between the renal pyramids is called the

    • Renal columns

    • Renal medulla

    • Renal pelvis

    Correct Answer
    A. Renal columns
    Explanation
    The portion of the kidney that extends between the renal pyramids is called the renal columns. These columns are made up of cortical tissue and they separate the renal pyramids. They serve to provide support and stability to the kidney structure. The renal columns also contain blood vessels that supply oxygen and nutrients to the surrounding tissues.

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  • 33. 

    The proximal convoluted tubules reabsorb what percentage of filtered water?

    • 25%

    • 50%

    • 65%

    Correct Answer
    A. 65%
    Explanation
    The proximal convoluted tubules are responsible for reabsorbing water from the filtrate in the kidney. This process allows the body to retain water and prevent excessive loss through urine. The correct answer of 65% suggests that a significant amount of filtered water is reabsorbed by the proximal convoluted tubules, indicating their crucial role in maintaining water balance in the body.

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  • 34. 

    This lies in the anterior cornea of the trigone of the bladder.

    • Ureter

    • Internal urethral orifice

    • Muscularis bundle

    Correct Answer
    A. Internal urethral orifice
    Explanation
    The internal urethral orifice is located in the anterior cornea of the trigone of the bladder. The trigone is a triangular area in the bladder formed by the openings of the ureters and the internal urethral orifice. The internal urethral orifice is the opening between the bladder and the urethra, allowing urine to pass from the bladder to the urethra for elimination from the body.

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  • 35. 

    This is located anterior to the esophagus and carries air to the bronchi.

    • Trachea

    • Larynx

    • Nasopharynx

    Correct Answer
    A. Trachea
    Explanation
    The trachea is a tube that is located in front of the esophagus and it carries air to the bronchi. It is commonly referred to as the windpipe and is an important part of the respiratory system. The trachea is responsible for allowing air to pass into the lungs, providing oxygen to the body and removing carbon dioxide. It is made up of rings of cartilage that help to keep the trachea open and prevent it from collapsing.

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  • 36. 

    Which of the below tissues forms the exchange surfaces of the alveolus?

    • Stratified squamous epithelium

    • Ciliated pseudostratified columnar epithelium with goblet cells

    • Simple squamous epithelium

    Correct Answer
    A. Simple squamous epithelium
    Explanation
    Simple squamous epithelium forms the exchange surfaces of the alveolus. This type of tissue is composed of a single layer of flat cells that allows for efficient diffusion of gases across the alveolar walls. The thinness of the cells and their close proximity to capillaries facilitate the exchange of oxygen and carbon dioxide between the lungs and bloodstream.

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  • 37. 

    The ascending loop of Henle is impermeable to

    • Urea

    • water

    • albumin

    Correct Answer
    A. water
    Explanation
    The ascending loop of Henle is impermeable to water. This means that water cannot pass through the walls of the ascending loop of Henle and be reabsorbed into the bloodstream. Instead, the ascending loop actively pumps sodium and chloride ions out of the tubule, creating a concentration gradient that allows for the reabsorption of water in the collecting ducts later on. This impermeability to water is an important mechanism in the kidney's ability to regulate water balance and concentrate urine.

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  • 38. 

    How much of the total volume of body fluid is intracellular fluid?

    • 50%

    • 1/3

    • 2/3

    Correct Answer
    A. 2/3
    Explanation
    The intracellular fluid refers to the fluid present inside the cells of the body. The given answer, 2/3, suggests that approximately two-thirds of the total volume of body fluid is intracellular fluid. This indicates that a significant portion of the body's fluid is contained within the cells themselves, while the remaining fluid is distributed in other areas such as the extracellular fluid.

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  • 39. 

    This is the most abundant mineral in the body.

    • Na+

    • Calcium

    • Magnesium

    Correct Answer
    A. Calcium
    Explanation
    Calcium is the correct answer because it is the most abundant mineral in the body. It plays a crucial role in various bodily functions, including the formation and maintenance of strong bones and teeth, muscle contraction, nerve function, and blood clotting. Calcium is also involved in regulating blood pressure and maintaining a healthy heart rhythm. It is found in dairy products, leafy greens, nuts, and seeds, and it is essential to consume an adequate amount of calcium through diet or supplements to support overall health.

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  • 40. 

    The conducting airways with the air that does not undergo respiratory exchange are known as the

    • Minimal volume

    • Residual volume

    • Respiratory dead space

    Correct Answer
    A. Respiratory dead space
    Explanation
    The conducting airways refer to the passages in the respiratory system that do not participate in gas exchange. These include the trachea, bronchi, and bronchioles. The air that passes through these airways without undergoing respiratory exchange is known as the respiratory dead space. This is because no oxygen is taken up by the blood and no carbon dioxide is eliminated. The respiratory dead space is important for maintaining the proper ventilation-perfusion ratio in the lungs and ensuring efficient gas exchange in the alveoli.

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  • 41. 

    Most of the phosphate in a body is present as:

    • DNA

    • Calcium phosphate salt

    • Carbohydrates

    Correct Answer
    A. Calcium phosphate salt
    Explanation
    Calcium phosphate salt is the correct answer because phosphate is an essential component of the mineralized matrix of bones and teeth, where it combines with calcium to form calcium phosphate salts. These salts provide strength and rigidity to the skeletal system. While phosphate is also present in DNA, it is a smaller proportion compared to the amount found in calcium phosphate salts. Carbohydrates do not contain significant amounts of phosphate.

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  • 42. 

    The nose connects with the pharynx through the

    • Septal cartilage

    • External nares

    • Choanae

    Correct Answer
    A. Choanae
    Explanation
    The choanae are the openings at the back of the nasal cavity that connect it to the pharynx. These openings allow air to pass from the nose into the throat and eventually into the lungs. The septal cartilage and external nares are also part of the nasal cavity, but they do not directly connect to the pharynx. Therefore, the correct answer is choanae.

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  • 43. 

    Pitch is controlled by

    • Vibration of the vocal chords

    • Tension of the vocal chords

    • Layers of cartilage in the vocal chords

    Correct Answer
    A. Tension of the vocal chords
    Explanation
    The correct answer is "Tension of the vocal chords" because pitch is primarily determined by the tension of the vocal cords. When the vocal cords are tightened, they vibrate faster and produce a higher pitch. Conversely, when the tension is reduced, the vocal cords vibrate slower and produce a lower pitch. Therefore, the tension of the vocal cords plays a crucial role in controlling the pitch of the voice.

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  • 44. 

    Exhalation begins when

    • Inspiratory muscles relax

    • Diaphragm contracts

    • Blood circulation is the lowest

    Correct Answer
    A. Inspiratory muscles relax
    Explanation
    Exhalation begins when the inspiratory muscles relax. During inhalation, the diaphragm and other inspiratory muscles contract, causing the lungs to expand and air to be drawn into the lungs. Once the inhalation is complete, the inspiratory muscles relax, allowing the lungs to passively recoil and air to be expelled from the lungs during exhalation. This relaxation of the inspiratory muscles is a crucial step in the breathing process, as it initiates the movement of air out of the lungs.

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  • 45. 

    This layer of filtration membrane is composed of collagen fibers and proteoglycans in a glycoprotein matrix.

    • Glomerular endothelial cells

    • Basal lamina

    • Pedicels

    Correct Answer
    A. Basal lamina
    Explanation
    The basal lamina is a layer of the filtration membrane in the glomerulus that is made up of collagen fibers and proteoglycans in a glycoprotein matrix. It acts as a physical barrier, preventing the passage of large molecules such as proteins, while allowing smaller molecules and ions to pass through. This layer helps in the filtration process by selectively allowing certain substances to be filtered and retained in the glomerulus while preventing others from passing through.

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  • 46. 

    The conducting zone does NOT act to:

    • Add water to air

    • Warm air

    • Does none of the above

    Correct Answer
    A. Does none of the above
    Explanation
    The conducting zone in the respiratory system is responsible for transporting air to and from the lungs. It consists of various structures such as the nose, trachea, bronchi, and bronchioles. Its main functions include filtering, moistening, and warming the air as it enters the respiratory system. Therefore, it does not add water to the air or warm the air, as these processes occur in other parts of the respiratory system such as the nasal cavity and the upper respiratory tract.

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  • 47. 

    When blood pH drops then the amount of oxyhemoglobin _______ and oxygen delivery to the tissue cells ________________.

    • Increases, decreases

    • Decreases, increases

    • Decreases, decreases

    Correct Answer
    A. Decreases, increases
    Explanation
    When blood pH drops, it causes a decrease in the amount of oxyhemoglobin. This is because a lower pH indicates a higher concentration of hydrogen ions in the blood, which can bind to hemoglobin and displace oxygen molecules. As a result, less oxygen is able to bind to hemoglobin and be transported to the tissue cells, leading to a decrease in oxygen delivery.

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  • 48. 

    Which of the below tissues provides the functions of the inner layer of the conducting organs?

    • Stratified squamous epithelium with keratinc.

    • ciliated pseudostratified columnar epithelium with goblet cells

    • Cilated cuboidal epithelium with goblet cells

    Correct Answer
    A. ciliated pseudostratified columnar epithelium with goblet cells
    Explanation
    The correct answer is ciliated pseudostratified columnar epithelium with goblet cells because this tissue type has cilia that help move mucus and other substances along the conducting organs, such as the respiratory tract. The goblet cells also secrete mucus to help trap and remove foreign particles. This combination of cilia and goblet cells is essential for the proper functioning of the inner layer of the conducting organs.

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  • 49. 

    Which structure of the nephron reabsorbs the most substances?

    • Ascending limb

    • Collecting duct

    • Proximal convoluted tubule

    Correct Answer
    A. Proximal convoluted tubule
    Explanation
    The proximal convoluted tubule is responsible for reabsorbing the majority of substances in the nephron. It is located immediately after the glomerulus and is highly specialized for reabsorption. The cells lining the proximal convoluted tubule have numerous microvilli, increasing the surface area available for reabsorption. This structure is involved in reabsorbing important substances such as glucose, amino acids, ions, and water, as well as secreting certain waste products. Overall, the proximal convoluted tubule plays a crucial role in maintaining the balance of substances in the body by reabsorbing the majority of filtered substances.

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