Exercise Physiology Practice Final

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  • 1/156 Questions

    The number of beats per minute is known as the heart rate

    • True
    • False
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About This Quiz

The 'Exercise Physiology Practice Final' assesses knowledge on the cardiovascular system, focusing on coronary circulation, pulmonary and systemic circuits, and cardiac muscle tissue. It is designed for learners preparing for advanced studies in human physiology.

Cardiovascular System Quizzes & Trivia

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  • 2. 

    At rest, expiration is passive

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Expiration refers to the process of exhaling or breathing out air. When a person is at rest, expiration is passive, meaning it does not require any active effort or muscular contraction. Instead, it occurs naturally due to the relaxation of the respiratory muscles and the elastic recoil of the lungs. This allows the air to be expelled from the lungs without any conscious effort from the individual. Therefore, the statement "At rest, expiration is passive" is true.

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  • 3. 

    What is considered normal blood presssure?

    • 115/75 mmHg

    • 140/90 mmHg

    • 120/80 mmHg

    • None of the above

    Correct Answer
    A. 120/80 mmHg
    Explanation
    The normal blood pressure is considered to be 120/80 mmHg. Blood pressure is measured in millimeters of mercury (mmHg) and consists of two numbers - the systolic pressure (top number) and the diastolic pressure (bottom number). A blood pressure reading of 120/80 mmHg indicates that the systolic pressure is 120 mmHg and the diastolic pressure is 80 mmHg. This is considered to be within the normal range and is a healthy blood pressure reading.

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  • 4. 

    During maximal exercise, 80 - 85% of blood is distributed to working muscles

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During maximal exercise, the body redirects a significant amount of blood flow to the working muscles in order to supply them with oxygen and nutrients needed for increased activity. This redistribution of blood allows the muscles to perform at their highest capacity. Therefore, it is true that 80-85% of blood is distributed to working muscles during maximal exercise.

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  • 5. 

    During prolonged exercise in a hot/humid environment, ventilation "drifts" upward due to the influence of rising body temperature on the respiratory control center

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During prolonged exercise in a hot/humid environment, the body's temperature increases, which affects the respiratory control center. As the body temperature rises, the respiratory control center responds by increasing the rate and depth of breathing. This increase in ventilation helps to cool the body down and maintain a stable internal temperature. Therefore, it is true that ventilation "drifts" upward due to the influence of rising body temperature on the respiratory control center during prolonged exercise in a hot/humid environment.

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  • 6. 

    Ventricular diastole is when the ventricles are relaxed/relaxing

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Ventricular diastole refers to the phase of the cardiac cycle when the ventricles are relaxed or relaxing. During this phase, the ventricles fill with blood from the atria. Therefore, the statement that ventricular diastole is when the ventricles are relaxed/relaxing is true.

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  • 7. 

    When heart rate increase, blood pressure increases

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When the heart rate increases, it means that the heart is pumping blood at a faster rate. This increased pumping action leads to an increase in the force exerted by the blood against the walls of the arteries, resulting in an increase in blood pressure. Therefore, it is true that when heart rate increases, blood pressure increases.

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  • 8. 

    Blood flow is inversely proportional to resistance

    • True

    • False

    Correct Answer
    A. True
    Explanation
    This statement is true because according to the principles of fluid dynamics, blood flow is inversely proportional to resistance. Resistance refers to the opposition encountered by blood flow as it passes through the blood vessels. When resistance increases, blood flow decreases, and vice versa. This relationship is governed by the Poiseuille's law, which states that blood flow is directly proportional to the fourth power of the radius of the blood vessel and the pressure difference between the two ends, while inversely proportional to the viscosity of the blood and the length of the blood vessel.

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  • 9. 

    Max heart rate is found by subtracting ones age from 230

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The explanation for the given answer is that the statement is incorrect. The correct formula to estimate the maximum heart rate is to subtract one's age from 220, not 230. Therefore, the answer is false.

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  • 10. 

    The peripheral chemoreceptors are sensitive to increases in PCO2 and decreases in PO2 or pH

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because peripheral chemoreceptors are specialized cells located in the carotid and aortic bodies that detect changes in the levels of carbon dioxide (PCO2), oxygen (PO2), and pH in the blood. When PCO2 increases or PO2 and pH decrease, these chemoreceptors send signals to the brain to increase the respiratory rate and depth in order to restore the balance of these gases in the body. Therefore, the statement accurately describes the sensitivity of peripheral chemoreceptors to increases in PCO2 and decreases in PO2 or pH.

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  • 11. 

    Cardiac output and total vascular resistance influence mean arterial pressure

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Cardiac output refers to the amount of blood pumped by the heart per minute, while total vascular resistance refers to the resistance encountered by blood flow in the blood vessels. Mean arterial pressure is the average pressure in the arteries during one cardiac cycle. Both cardiac output and total vascular resistance play a significant role in determining mean arterial pressure. An increase in cardiac output or a decrease in total vascular resistance will result in an increase in mean arterial pressure, while a decrease in cardiac output or an increase in total vascular resistance will lead to a decrease in mean arterial pressure. Therefore, it is true that cardiac output and total vascular resistance influence mean arterial pressure.

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  • 12. 

    When blood volume increases, blood pressure increases

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When blood volume increases, there is more blood circulating in the blood vessels. This increased volume of blood puts more pressure on the walls of the blood vessels, leading to an increase in blood pressure. Therefore, it is true that when blood volume increases, blood pressure also increases.

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  • 13. 

    The pacemaker of the heart is known as the _________

    • SA node

    • AV node

    • Bundle fibers

    • Purkinje fibers

    Correct Answer
    A. SA node
    Explanation
    The pacemaker of the heart is known as the SA node. The SA node, or sinoatrial node, is a group of specialized cells located in the right atrium of the heart. It generates electrical impulses that regulate the heart's rhythm and initiate each heartbeat. These impulses are then conducted to the rest of the heart, causing it to contract and pump blood effectively. The SA node is often referred to as the natural pacemaker of the heart because it sets the pace for the rest of the cardiac conduction system.

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  • 14. 

    There is new evidence that respiratory muscle fatigue does occur during high intensity exercise (>90% VO2 max)

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The given answer is true because there is new evidence suggesting that respiratory muscle fatigue does occur during high-intensity exercise, specifically when the exercise intensity is above 90% of the maximum oxygen consumption (VO2 max). This means that the muscles responsible for breathing can become fatigued and may impact an individual's ability to maintain a high level of exercise intensity for an extended period of time.

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  • 15. 

    Training can lower exercise ventilation 20 - 30% lower at the same submaximal work rate

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Training can lower exercise ventilation by 20-30% at the same submaximal work rate. This means that individuals who engage in regular training can achieve the same level of exercise intensity with reduced ventilation compared to untrained individuals. This is because training improves cardiovascular fitness, allowing the heart to pump more efficiently and deliver oxygen to the muscles more effectively. As a result, the respiratory system does not have to work as hard to meet the oxygen demands of the body during exercise, leading to lower ventilation rates.

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  • 16. 

    Hematocrit is a % by volume of packed blood cells after centrifugation

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Hematocrit is indeed a percentage that represents the volume of packed red blood cells in relation to the total blood volume after centrifugation. This measurement is commonly used to assess the overall health and function of the blood. Therefore, the statement is accurate and the answer "True" is correct.

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  • 17. 

    Endurance athletes typically have a stroke volume of 160 - 200 ml during exercise

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Endurance athletes typically have a higher stroke volume during exercise compared to individuals who are not endurance athletes. Stroke volume refers to the amount of blood pumped by the heart with each beat. This increased stroke volume is a result of the athlete's cardiovascular adaptations to endurance training, such as an enlarged heart and improved cardiac function. A stroke volume of 160 - 200 ml is within the range commonly observed in endurance athletes during exercise. Therefore, the statement is true.

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  • 18. 

    Low partial pressure in the tissues increases the the chance of O2 release to tissues by Hb

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When the partial pressure of oxygen in the tissues is low, it creates a concentration gradient that favors the release of oxygen from hemoglobin (Hb) to the tissues. This is because hemoglobin binds oxygen in the lungs where the partial pressure is high, and then releases it in areas where the partial pressure is low. Therefore, when the partial pressure in the tissues is low, it increases the chance of oxygen release to the tissues by hemoglobin.

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  • 19. 

    Carbonic anhydrase converts CO2 and water into Bicarbonate

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Carbonic anhydrase is an enzyme found in red blood cells that catalyzes the conversion of carbon dioxide (CO2) and water (H2O) into bicarbonate (HCO3-) ions. This reaction is an important step in the transport of CO2 from tissues to the lungs for elimination. Bicarbonate ions are more soluble and can easily be transported in the blood, while CO2 is less soluble and needs to be converted for efficient removal. Therefore, the statement that carbonic anhydrase converts CO2 and water into bicarbonate is true.

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  • 20. 

    An increase in pulmonary ventilation causes exhalation of additional CO2, which results in a reduction of blood PCO2 and a lowering of hydrogen ion concentration

    • True

    • False

    Correct Answer
    A. True
    Explanation
    An increase in pulmonary ventilation refers to an increase in the amount of air that is breathed in and out of the lungs. This increased ventilation leads to the exhalation of additional carbon dioxide (CO2) from the body. As a result, the levels of CO2 in the blood decrease, leading to a reduction in blood PCO2 (partial pressure of carbon dioxide) and a decrease in the concentration of hydrogen ions. This statement is true because increased pulmonary ventilation leads to a decrease in blood PCO2 and hydrogen ion concentration.

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  • 21. 

    The myocardium is mainly aerobic

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The myocardium refers to the muscular tissue of the heart. It is responsible for pumping blood throughout the body. The myocardium requires a constant supply of oxygen to function properly. This is because the heart needs to generate a significant amount of energy to contract and pump blood effectively. Aerobic metabolism, which relies on oxygen, is the most efficient way for the myocardium to produce this energy. Therefore, it can be concluded that the myocardium is mainly aerobic.

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  • 22. 

    Pulse pressure is the difference between systolic and diastolic pressure

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Pulse pressure is defined as the difference between systolic and diastolic pressure. Systolic pressure is the highest pressure in the arteries during a heartbeat, while diastolic pressure is the lowest pressure between heartbeats. The pulse pressure is important because it reflects the force exerted on the arterial walls when the heart contracts. A wider pulse pressure may indicate increased arterial stiffness or other cardiovascular conditions. Therefore, the statement that pulse pressure is the difference between systolic and diastolic pressure is true.

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  • 23. 

    Contraction of the heart depends on electrical stimulation of the _________

    • Epithelium of the heart

    • Fibrocardium

    • Endothelium

    • Myocardium

    Correct Answer
    A. Myocardium
    Explanation
    The contraction of the heart is controlled by electrical stimulation, which originates from the myocardium. The myocardium is the muscular middle layer of the heart that is responsible for the pumping action. It consists of specialized cardiac muscle cells that are capable of generating electrical impulses and coordinating the contraction of the heart. The contraction of the myocardium propels blood throughout the body and ensures the proper functioning of the cardiovascular system.

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  • 24. 

    The ECG may indicate coronary heart disease

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The ECG (electrocardiogram) is a test that measures the electrical activity of the heart. It can provide valuable information about the heart's rhythm and any potential abnormalities. Coronary heart disease is a condition where the blood vessels that supply the heart with oxygen and nutrients become narrowed or blocked. This can lead to chest pain, heart attacks, and other complications. The ECG can detect certain patterns or changes in the heart's electrical activity that may indicate the presence of coronary heart disease. Therefore, the statement "The ECG may indicate coronary heart disease" is true.

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  • 25. 

    The atria relaxes during ventricular systole

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During ventricular systole, the ventricles contract to pump blood out of the heart. In order for this to happen efficiently, the atria must relax to allow the blood to flow from the atria into the ventricles. This relaxation of the atria allows for proper filling of the ventricles before they contract. Therefore, the statement that the atria relaxes during ventricular systole is true.

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  • 26. 

    Autorhythmic cells depolarize spontaneously 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Autorhythmic cells are specialized cells found in the heart that have the ability to generate their own electrical impulses without any external stimulation. These cells depolarize spontaneously, meaning they initiate action potentials on their own. This is important for the regulation of the heart's rhythm and the coordination of its contractions. Therefore, the statement "Autorhythmic cells depolarize spontaneously" is true.

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  • 27. 

    Amount of blood ejected in each beat is known as the _______

    • Stroke volume

    • Ejection fraction

    • End diastolic volume

    • End systolic volume

    Correct Answer
    A. Stroke volume
    Explanation
    The amount of blood ejected in each beat is known as the stroke volume. This refers to the volume of blood pumped out of the left ventricle of the heart with each contraction. It is an important measure of cardiac function and is influenced by factors such as heart rate, contractility, and preload. The stroke volume can be calculated by subtracting the end systolic volume from the end diastolic volume.

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  • 28. 

    Vasoconstriction to visceral organs and inactive tissues are due to the SNS

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The sympathetic nervous system (SNS) is responsible for the "fight or flight" response in the body. When activated, it causes vasoconstriction, which is the narrowing of blood vessels, to visceral organs and inactive tissues. This helps to redirect blood flow to the skeletal muscles and other organs that are needed during times of stress or physical activity. Therefore, the statement that vasoconstriction to visceral organs and inactive tissues are due to the SNS is true.

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  • 29. 

    The intrapleural pressure is lower than atmospheric pressure

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Intrapleural pressure refers to the pressure within the pleural cavity, which is the space between the lungs and the chest wall. Normally, the intrapleural pressure is lower than atmospheric pressure. This pressure difference helps to keep the lungs inflated and allows for proper breathing. If the intrapleural pressure were to equal or exceed atmospheric pressure, it could lead to lung collapse or difficulty in breathing. Therefore, the statement that the intrapleural pressure is lower than atmospheric pressure is true.

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  • 30. 

    Arterial PO2 and PCO2 are maintained relatively constant during a sub maximal exercise

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During submaximal exercise, arterial PO2 and PCO2 are maintained relatively constant to ensure adequate oxygen delivery to the tissues and removal of carbon dioxide. This is achieved through the regulation of ventilation and blood flow. Ventilation increases to enhance oxygen uptake and carbon dioxide removal, while blood flow to the working muscles increases to deliver oxygen and remove waste products. These adjustments help maintain a stable arterial PO2 and PCO2, ensuring the body's metabolic needs are met during exercise.

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  • 31. 

    Receptors that are sensitive to force and speed of muscular movement

    • Baroreceptors

    • Muscle mechanoreceptors

    • Heart mechanoreceptors

    • Muscle chemoreceptors

    Correct Answer
    A. Muscle mechanoreceptors
    Explanation
    Muscle mechanoreceptors are receptors that are sensitive to the force and speed of muscular movement. These receptors are located in the muscles and provide feedback to the central nervous system about the position, movement, and tension of muscles. They play a crucial role in proprioception, which is the body's ability to sense its own position and movement in space. By detecting changes in muscle length, tension, and speed, muscle mechanoreceptors help to coordinate and control muscle contractions, allowing for smooth and coordinated movement.

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  • 32. 

    The systemic circulation begins at the left side of the heart

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The systemic circulation refers to the pathway of blood flow from the left side of the heart to the rest of the body and back to the right side of the heart. The left side of the heart receives oxygenated blood from the lungs and pumps it out into the aorta, the largest artery in the body. From the aorta, the oxygenated blood is distributed to all the organs, tissues, and cells in the body through a network of smaller arteries, arterioles, and capillaries. Eventually, the deoxygenated blood returns to the right side of the heart through the veins to be pumped to the lungs for oxygenation again. Therefore, the statement that the systemic circulation begins at the left side of the heart is true.

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  • 33. 

    VO2 = Cardio Output x VO2 difference; which equation is this?

    • Fick Equation

    • Blow Resistance Equatio

    • Blood Flow Equation

    • Rick Equation

    • None of the above

    Correct Answer
    A. Fick Equation
    Explanation
    The given equation, VO2 = Cardio Output x VO2 difference, is known as the Fick Equation. This equation is used to calculate the oxygen consumption (VO2) by multiplying the cardiac output (the amount of blood pumped by the heart per minute) with the difference in oxygen content between arterial and venous blood. It is commonly used in exercise physiology to measure an individual's aerobic capacity.

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  • 34. 

    During prolonged exercise, cardiac output is decreases

    • True

    • False

    Correct Answer
    A. False
    Explanation
    During prolonged exercise, cardiac output actually increases. This is because the body needs to deliver more oxygen and nutrients to the muscles to sustain the activity. Cardiac output is the amount of blood pumped by the heart per minute, and it is determined by the heart rate and stroke volume. During exercise, both heart rate and stroke volume increase, leading to an overall increase in cardiac output. Therefore, the statement that cardiac output decreases during prolonged exercise is false.

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  • 35. 

    Beta blocking drugs increase heart rate

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Beta blocking drugs actually decrease heart rate. These drugs work by blocking the effects of adrenaline on the beta receptors in the heart, which leads to a decrease in heart rate and blood pressure. By blocking these receptors, beta blockers help to reduce the workload on the heart and are commonly used to treat conditions such as high blood pressure, angina, and certain heart rhythm disorders. Therefore, the statement "Beta blocking drugs increase heart rate" is false.

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  • 36. 

    Venoconstriction is stimulated by the SNS

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Venoconstriction refers to the narrowing of blood vessels, specifically veins. The sympathetic nervous system (SNS) is responsible for controlling various involuntary bodily functions, including the constriction of blood vessels. When the SNS is activated, it releases norepinephrine, which causes the smooth muscles in the walls of veins to contract, leading to venoconstriction. Therefore, it can be concluded that venoconstriction is indeed stimulated by the SNS, making the answer "True."

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  • 37. 

    During exercise, the SV plateaus at approx. 40-60% of VO2 max

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During exercise, the stroke volume (SV) refers to the amount of blood pumped by the heart with each beat. It is generally observed that the SV plateaus, or reaches a steady state, at around 40-60% of the maximum oxygen consumption (VO2 max). This means that beyond this intensity of exercise, the SV does not increase significantly. Therefore, the given statement that the SV plateaus at approximately 40-60% of VO2 max is true.

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  • 38. 

    When the diaphragm contracts, the lungs __________

    • Expire

    • Inspire

    • The abdominals control breathing, not diaphrams

    • None of the above

    Correct Answer
    A. Inspire
    Explanation
    When the diaphragm contracts, it moves downward and flattens, causing the chest cavity to expand. This expansion creates a negative pressure within the lungs, causing air to be drawn in from the outside. This process is known as inspiration.

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  • 39. 

    There are 2 types or Humoral receptors

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement "There are 2 types of Humoral receptors" is true. Humoral receptors are a type of receptor found in the body that respond to substances in the blood or other body fluids. These receptors are classified into two types based on their location and function: intracellular receptors and cell surface receptors. Intracellular receptors are found inside the cell and respond to lipid-soluble molecules that can pass through the cell membrane, while cell surface receptors are located on the cell membrane and respond to water-soluble molecules that cannot pass through the cell membrane. Therefore, the statement is true.

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  • 40. 

    After leaving the myocardium, blood from the coronary circulation enters the coronary sinus

    • True

    • False

    Correct Answer
    A. True
    Explanation
    After the blood has passed through the myocardium, it enters the coronary sinus. The coronary sinus is a large vein located on the posterior side of the heart. It collects deoxygenated blood from the coronary circulation and drains it into the right atrium of the heart. This allows for the blood to be returned to the heart and then pumped to the lungs for oxygenation. Therefore, the statement that blood from the coronary circulation enters the coronary sinus is true.

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  • 41. 

    A T wave inversion is an indicator of ischemia

    • True

    • False

    Correct Answer
    A. True
    Explanation
    T wave inversion refers to a change in the electrical pattern of the heart seen on an electrocardiogram (ECG). It is commonly associated with myocardial ischemia, which is a condition where there is reduced blood flow to the heart muscle. Ischemia can be caused by various factors such as atherosclerosis or coronary artery disease. The T wave inversion is considered an important indicator of ischemia because it suggests abnormalities in the repolarization of the heart muscle. Therefore, the statement "A T wave inversion is an indicator of ischemia" is true.

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  • 42. 

    When blood viscosity increases, blood pressure decreases

    • True

    • False

    Correct Answer
    A. False
    Explanation
    An increase in blood viscosity actually leads to an increase in blood pressure rather than a decrease. Blood viscosity refers to the thickness or stickiness of the blood. When blood becomes thicker, it has a harder time flowing through blood vessels, causing resistance and therefore an increase in blood pressure. This is because the heart has to pump harder to push the thicker blood through the vessels. Therefore, the given statement is false.

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  • 43. 

    Receptors that are sensitive to change in arterial blood pressure.

    • Heart chemoreceptors

    • Muscle mechanorecptors

    • Baroreceptors

    • Muscle chemoreceptors

    Correct Answer
    A. Baroreceptors
    Explanation
    Baroreceptors are receptors that are sensitive to changes in arterial blood pressure. These receptors are located in the walls of the blood vessels, particularly in the aorta and carotid arteries. When there is a change in blood pressure, the baroreceptors send signals to the brain, specifically to the medulla oblongata, which then regulates the heart rate and blood vessel diameter to maintain blood pressure within a normal range. Therefore, baroreceptors play a crucial role in the body's homeostatic mechanism for regulating blood pressure.

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  • 44. 

    The atria contract during ventricular diastole

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During ventricular diastole, the ventricles are relaxed and filling with blood. The atria, on the other hand, are in a state of contraction called atrial systole. This contraction helps to push the remaining blood from the atria into the ventricles, completing the filling process. Therefore, the statement that the atria contract during ventricular diastole is true.

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  • 45. 

    The QRS complex represents ____________

    • Atrial repolarization

    • Atrial depolarization

    • Ventricular depolarization

    • Ventricular repolarization

    Correct Answer
    A. Ventricular depolarization
    Explanation
    The QRS complex represents ventricular depolarization. This is the electrical activation of the ventricles, causing them to contract and pump blood out of the heart. The QRS complex is seen on an electrocardiogram (ECG) as a series of waves and intervals, and it indicates the initiation of the main pumping action of the heart. Atrial repolarization and depolarization occur during the P wave and T wave, respectively, while ventricular repolarization occurs during the T wave.

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  • 46. 

    Cardiac muscle tissue is also known as endocardium

    • True

    • False

    Correct Answer
    A. False
    Explanation
    myocardium

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  • 47. 

    At the onset of exercise, parasympathetic nerves fire thus increasing the HR 

    • True

    • False

    Correct Answer
    A. False
    Explanation
    sympathetic nerves increase the HR

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  • 48. 

    During prolonged exercise, the cardiac output is maintained due to a decrease in stroke volume and an increase in HR.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    During prolonged exercise, the cardiac output, which is the amount of blood pumped by the heart per minute, is maintained. This is achieved by two mechanisms: a decrease in stroke volume, which is the amount of blood pumped by the heart with each beat, and an increase in heart rate. The decrease in stroke volume helps to conserve energy and prevent fatigue, while the increase in heart rate ensures that an adequate amount of blood is still being pumped to meet the body's oxygen and nutrient demands during exercise. Therefore, the statement is true.

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  • 49. 

    Which zone warms and humidifies the air?

    • Conducting zone

    • Respiratory zone

    • Terminal zone

    Correct Answer
    A. Conducting zone
    Explanation
    The conducting zone is responsible for warming and humidifying the air. This zone includes the nasal cavity, trachea, bronchi, and bronchioles. As the air travels through these structures, it is warmed and humidified by the surrounding tissues and mucus. This ensures that the air reaching the respiratory zone is at the optimal temperature and humidity for gas exchange to occur in the lungs.

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  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 01, 2010
    Quiz Created by
    Kingslo
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