Anatomy And Physiology Questions - The Respiratory System

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This structure prevents food or water from entering the trachea.
- Arytenoid cartilage
- Epiglottis
- Nasopharynx
- Thyroid cartilage
- Paranasal sinus

Anatomy And Physiology Questions - The Respiratory System - Quiz

About This Quiz

Respiratory system questions. Related to the 'Young adult' case unit. Also contains some questions from the "Fetal" case unit (haemoglobin dissociation curve, surfactant questions)

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2.

This is the primary gas exchange site.
- Trachea
- Bronchiole
- Nasal sinuses
- Alveolus
- Bronchus
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 very thin and surrounded by a network of blood vessels. This allows for the exchange of oxygen and carbon dioxide between the air in the alveoli and the bloodstream. Oxygen from the inhaled air diffuses into the bloodstream, while carbon dioxide, a waste product of cellular respiration, diffuses out of the bloodstream and into the alveoli to be exhaled.

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3.

This is direction of diffusion of gasese 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
- Oxygen out of blood, carbon dioxide out of blood
Correct Answer

A. Oxygen into blood, carbon dioxide out of blood

Explanation

At the alveoli of the lungs, oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli. This occurs due to differences in concentration and partial pressure of these gases on either side of the alveolar membrane. Oxygen is transported by binding to hemoglobin in red blood cells and is then carried to the body tissues, while carbon dioxide is produced as a waste product of cellular respiration and is removed from the body through exhalation.

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4.

This is located anterior to the oesophagus and carries air to the bronchi.
- Trachea
- Larynx
- Nasopharynx
- Pharynx
- None of the above
Correct Answer

A. Trachea

Explanation

The trachea is a tube located in front of the esophagus that carries air to the bronchi. It is commonly known as the windpipe and is responsible for allowing air to pass from the mouth and nose to the lungs. The trachea is made up of rings of cartilage that help to keep it open and prevent it from collapsing. It is an important part of the respiratory system and plays a crucial role in breathing.

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5.

Which of the following is not part of the upper respiratry system?
- Nose
- Oral cavity
- 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 nose, oral cavity, pharynx, and nasal meatuses. The trachea, also known as the windpipe, is part of the lower respiratory system. It connects the larynx to the bronchi and allows air to pass into the lungs.

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6.

What is E pointing to?
- Soft palate
- Ethmoid bone
- Hard palate
- Nasal septum
- Air cells
Correct Answer

A. Nasal septum

Explanation

E is pointing to the nasal septum. The nasal septum is a structure that divides the nasal cavity into two halves. It is made up of bone and cartilage and helps to support the nose and maintain its shape. The nasal septum also plays a role in directing airflow and separating the two nostrils.

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7.

The point where the trachea divides into right and left primary bronchi is a ridge called
- Carina
- Secondary bronchioles
- Parietal pleura
- Visceral pleura
- Diaphragm
Correct Answer

A. Carina

Explanation

The correct answer is Carina. The carina is a ridge located at the point where the trachea splits into the right and left primary bronchi. It is an important anatomical landmark in the respiratory system.

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8.

Where is the epiglottis?
- O
- R
- S
- F
- Q
Correct Answer

A. O

Explanation

The epiglottis is located in the throat, specifically at the base of the tongue. It is a flap of cartilage that prevents food and liquid from entering the windpipe during swallowing, directing them instead into the esophagus.

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9.

What is line J pointing to?
- Right secondary bronchus
- Left secondary bronchus
- Right primary bronchus
- Left primary bronchus
- Carina
Correct Answer

A. Left primary bronchus

Explanation

Line J is pointing to the left primary bronchus. The primary bronchi are the first branches of the trachea that lead into the lungs. The left primary bronchus specifically enters the left lung and further divides into smaller bronchi within the lung. Therefore, line J is indicating the left primary bronchus.

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10.

Where is the soft palate?
- C
- E
- G
- Q
- S
Correct Answer

A. E

Explanation

The soft palate is located at the back of the roof of the mouth. It is a muscular structure that separates the oral cavity from the nasal cavity. The soft palate plays a crucial role in speech production and swallowing.

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11.

These are cells of the alveoli that produces surfactant.
- Type I alveolar cells
- Type II alveolar cells
- Type III alveolar cells
- Surface cells
- Macrophages
Correct Answer

A. Type II alveolar cells

Explanation

Type II alveolar cells are responsible for producing surfactant, a substance that helps to reduce the surface tension in the alveoli. Surfactant is crucial for maintaining the elasticity of the alveoli and preventing their collapse during exhalation. Type I alveolar cells, on the other hand, are responsible for gas exchange in the lungs. Type III alveolar cells do not exist, and surface cells and macrophages have different functions in the lungs.

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12.

Where are the nasal conchae?
- A
- C
- T
- U
- V
Correct Answer

A. C

Explanation

The nasal conchae are located in the nasal cavity. They are bony structures that protrude from the lateral walls of the nasal cavity and help to increase the surface area of the nasal passages. This increased surface area helps to warm and humidify the air as it passes through the nose, making it more comfortable for the lungs. The nasal conchae also play a role in filtering and trapping dust, pollen, and other particles from the air before it reaches the lungs.

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13.

Which of the below tissues forms the exchange surfaces of the alveolus?
- Strafied squamous epithelium
- Ciliated pseudostratified columnar epithelium with goblet cells
- Simple squamous epithelium
- Hyaline cartilage
- Columnar connective tissue with goblet cells
Correct Answer

A. Simple squamous epithelium

Explanation

Simple squamous epithelium forms the exchange surfaces of the alveolus. This type of epithelium is composed of a single layer of flat cells that allow for efficient diffusion of gases, such as oxygen and carbon dioxide, across the thin walls of the alveoli. The flat shape of the cells provides a large surface area for gas exchange, while their thinness allows for rapid diffusion of molecules. This type of epithelium is well-suited for its function in facilitating efficient gas exchange in the lungs.

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14.

The conducting airways with the air that does not undergo respiratory exchange are known as the
- Inspiratory volume
- Expiratory reserve volume
- 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 air does not contribute to the exchange of oxygen and carbon dioxide in the lungs. Instead, it remains in the conducting airways and gets exhaled without being involved in gas exchange with the blood.

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15.

This means the lungs and the chest wall expand easily.
- High surface tension
- Low surface tension
- High compliance
- Low compliance
- None of the above
Correct Answer

A. High compliance

Explanation

High compliance refers to the ability of the lungs and chest wall to easily expand. When the compliance is high, it means that there is less resistance to the expansion of the lungs and chest wall, allowing for efficient breathing. This can be attributed to the elasticity and flexibility of the lung tissue and the surrounding structures. Therefore, the statement "This means the lungs and the chest wall expand easily" is explained by the concept of high compliance.

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16.

Which is the dominant method of carbon dioxide transport?
- Bound to haemoglobin
- Bound to oxygen
- Dissolved in plasma as a gas
- Dissolved in plasma as bicarbonate ions
- Diffusion
Correct Answer

A. Dissolved in plasma as bicarbonate ions

Explanation

The dominant method of carbon dioxide transport in the body is through its dissolution in plasma as bicarbonate ions. This process occurs mainly in the red blood cells, where carbon dioxide combines with water to form carbonic acid. This acid then dissociates into bicarbonate ions and hydrogen ions. The bicarbonate ions are transported in the plasma, while the hydrogen ions bind to hemoglobin. This mechanism allows for efficient removal of carbon dioxide from tissues and its transport to the lungs for elimination.

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17.

What lines are pointing to tertiary bronchi?
- E and K
- D and J
- F and L
- H and M
- A and B
Correct Answer

A. F and L
18.

What is B pointing to?
- Carina
- Visceral pleura
- Parietal pleura
- Pleural cavity
- Diaphragm
Correct Answer

A. Parietal pleura

Explanation

B is most likely pointing to the parietal pleura. The parietal pleura is the outer layer of the pleura, a membrane that lines the thoracic cavity and covers the lungs. It is responsible for protecting and lubricating the lungs, allowing them to expand and contract during breathing. The other options, Carina, Visceral pleura, Pleural cavity, and Diaphragm, are not typically pointed to when discussing the anatomy of the lungs and thoracic cavity.

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19.

What is also referred to as the Adam's Apple?
- G
- H
- I
- J
- K
Correct Answer

A. J

Explanation

J is the correct answer because the Adam's Apple is a prominent lump in the throat that is formed by the thyroid cartilage. It is more prominent in males due to the effects of testosterone during puberty, which causes the cartilage to grow larger. The term "Adam's Apple" is derived from the biblical story of Adam and Eve, where it is believed that a piece of the forbidden fruit got stuck in Adam's throat, creating a visible protrusion.

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20.

Where is the tracheal cartilage?
- J
- I
- H
- G
- F
Correct Answer

A. J
21.

The conducting zone's role is to
- Clean air of debris
- Conduct air into the lungs
- Add water to air
- Warm air
- All of the above
Correct Answer

A. All of the above

Explanation

The conducting zone in the respiratory system has multiple functions. It helps in cleaning the air of debris by trapping particles in the mucus lining the airways. It also conducts air into the lungs by providing a pathway for air to flow in and out. Additionally, it adds moisture to the air to prevent the lungs from drying out. Lastly, it helps in warming the air to match the body's temperature before it reaches the delicate lung tissues. Therefore, the correct answer is "All of the above."

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22.

What is line A pointing to?
- Hyoid bone
- Trachea
- Adam's apple
- Thyroid
- Epiglottis
Correct Answer

A. Epiglottis

Explanation

Line A is pointing to the epiglottis. The epiglottis is a flap of cartilage located at the base of the tongue, above the larynx. Its main function is to prevent food and liquid from entering the airway during swallowing. When we swallow, the epiglottis closes over the opening of the larynx, directing the food or liquid down the esophagus and into the stomach. This helps to prevent choking or aspiration of foreign objects into the respiratory system.

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23.

This provides disease resistance within the lungs.
- A
- B
- C
- D
- None of the above
Correct Answer

A. D

Explanation

The given answer "D" states that none of the options A, B, or C provide disease resistance within the lungs. This implies that options A, B, and C do not have any specific properties or mechanisms that can offer disease resistance in the lungs. Therefore, the correct answer suggests that there is no option among A, B, or C that provides disease resistance in the lungs.

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24.

Which of the following is NOT a factor that the rate of pulmonary and systemic gas exchange depends on?
- Partial pressure difference of the gases
- Surface area for gas exchange
- Diffusion distance
- Molecular weight and solubility of the gases
- Force of contraction of diaphragm
Correct Answer

A. Force of contraction of diaphragm

Explanation

The rate of pulmonary and systemic gas exchange depends on several factors, including the partial pressure difference of the gases, surface area for gas exchange, diffusion distance, and molecular weight and solubility of the gases. However, the force of contraction of the diaphragm is not a factor that directly affects the rate of gas exchange. The diaphragm is primarily responsible for regulating the process of breathing by creating changes in thoracic pressure, which in turn facilitates gas exchange. Therefore, the force of contraction of the diaphragm is not a factor that directly affects the rate of gas exchange.

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25.

Pitch is controlled by
- Vibration of the vocal chords
- Tension of the vocal chords
- Layers of cartilage in the vocal chords
- Arrangement of the vocal chords
- None of the above
Correct Answer

A. Tension of the vocal chords

Explanation

The pitch of a sound is determined by the tension of the vocal chords. When the vocal chords are more tense, they vibrate at a higher frequency, resulting in a higher pitch. Conversely, when the vocal chords are less tense, they vibrate at a lower frequency, producing a lower pitch. The other options mentioned in the question, such as vibration of the vocal chords, layers of cartilage in the vocal chords, and arrangement of the vocal chords, do not directly control the pitch of the sound.

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26.

Which of the below tissues maintains open airways in the lower respiratory system?
- Stratified squamous epithelium with keratin
- Ciliated pseudostratified columnar epithelium with goblet cells
- Hyaline cartilage
- Mucus membrane
- Bone
Correct Answer

A. Hyaline cartilage

Explanation

Hyaline cartilage maintains open airways in the lower respiratory system. It is a flexible and elastic connective tissue found in the trachea and bronchi. It provides support to the airways, preventing their collapse during breathing. The smooth surface of hyaline cartilage allows for easy passage of air, ensuring that the airways remain open and unobstructed. This helps in the efficient exchange of oxygen and carbon dioxide in the lungs.

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27.

Exhalation begins when
- Inspiratory muscles relax
- Diaphragm contracts
- Blood circulation is the lowest
- Inspiratory muscles relax and diaphragm contracts
- Inspiratory muscles relax, diagphragm contracts and blood circulation is the lowest
Correct Answer

A. Inspiratory muscles relax

Explanation

When the inspiratory muscles relax, it allows the diaphragm to contract. This contraction of the diaphragm creates negative pressure in the thoracic cavity, causing air to be drawn into the lungs. Exhalation begins when the inspiratory muscles relax because it is the moment when the diaphragm starts to contract, initiating the inhalation process.

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28.

Where is the inferior nasal concha?
- A
- B
- C
- D
- E
Correct Answer

A. C

Explanation

The inferior nasal concha is located in the nasal cavity. It is a curved bone that helps to humidify and filter the air we breathe in.

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29.

Which of the following is a passageway for air, food and water?
- Pharynx
- Larynx
- Paranasal sinuses
- Trachea
- Oesophagus
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. When we breathe, air passes through the pharynx before entering the trachea. When we swallow, food and water pass through the pharynx on their way to the esophagus. The larynx, paranasal sinuses, and trachea are also involved in the respiratory and digestive systems, but they do not serve as a passageway for all three substances.

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30.

Which of the below tissues provides the functions of the inner layer of the conducting organs?
- Stratified squamous epithelium with keratin
- Ciliated pseudostratified columnar epithelium with goblet cells
- Cilated cuboidal epithelium with goblet cells
- Transitional epithelium with cilia
- Columnar connective tissue 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. This tissue is found in the inner layer of the conducting organs, such as the respiratory tract. The cilia help to move mucus and trapped particles out of the respiratory system, while the goblet cells produce mucus to trap these particles. The pseudostratified columnar arrangement of the cells provides a large surface area for these functions to take place.

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31.

Where is the cricoid cartilage?
- D
- E
- F
- G
- H
Correct Answer

A. H

Explanation

The cricoid cartilage is located in the neck. It is a ring-shaped cartilage that forms the lower part of the larynx, or voice box. The cricoid cartilage sits just below the thyroid cartilage, also known as the Adam's apple. It is an important structure in the respiratory system as it helps to maintain the patency of the airway and supports the vocal cords.

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32.

During swallowing, which structures rises?
- Pharynx
- Oesophagus
- Trachea
- Palatine tonsils
- Primary bronchi
Correct Answer

A. Pharynx

Explanation

During swallowing, the pharynx rises. The pharynx is a muscular tube located behind the mouth and nasal cavity. It plays a crucial role in the process of swallowing by contracting and pushing the food or liquid into the esophagus. The rise of the pharynx helps to close off the nasal passages and prevent food or liquid from entering the respiratory system.

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33.

Which cell secretes surfactant?
- A
- B
- C
- D
- None of the above
Correct Answer

A. A

Explanation

Cell A secretes surfactant.

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1
34.

Where is the middle nasal concha?
- A
- B
- C
- D
- E
Correct Answer

A. B

Explanation

The middle nasal concha is located in the nasal cavity. It is a scroll-like bone structure that helps to increase the surface area of the nasal cavity, allowing for better filtration, warming, and humidification of the inhaled air.

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35.

This is the sum of the residual and the expiratory reserve volume.
- Total lung capacity
- Functional residual capacity
- Inspiratory capacity
- Vital capacity
- Minimal volume
Correct Answer

A. Functional residual capacity

Explanation

The functional residual capacity is the volume of air remaining in the lungs after a normal expiration. It is the sum of the residual volume (the volume of air remaining in the lungs after a maximal expiration) and the expiratory reserve volume (the additional volume of air that can be exhaled after a normal expiration). Therefore, the given statement accurately describes the functional residual capacity.

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36.

In this portion of the lungs, the epithelial lining is simple squamous.
- A
- B
- C
- D
- E
Correct Answer

A. E
37.

Which tonsils are found in the oropharynx?
- V
- R
- S
- Q
- U
Correct Answer

A. R

Explanation

The tonsils found in the oropharynx are known as the palatine tonsils. These are a pair of almond-shaped masses of lymphatic tissue located on both sides of the throat, at the back of the mouth. They play a role in the immune system, helping to fight off infections that enter the body through the mouth and nose. The palatine tonsils can sometimes become enlarged or infected, leading to conditions such as tonsillitis.

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38.

This is a ring of hyaline cartilage that forms the inferior wall of the larynx.
- J
- K
- G
- H
- O
Correct Answer

A. K

Explanation

The ring of hyaline cartilage that forms the inferior wall of the larynx is known as the cricoid cartilage. It is the only complete ring of cartilage in the larynx and serves as a support structure for the vocal cords. The cricoid cartilage connects to the thyroid cartilage above it and the trachea below it, providing stability and protection to the larynx.

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39.

This is the primary gas exchange structure.
- A
- B
- C
- D
- E
Correct Answer

A. E

Explanation

Answer E is the correct answer because it is stated that it is the primary gas exchange structure. The other options (A, B, C, and D) are not mentioned or described as gas exchange structures, so they cannot be the correct answer.

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40.

Where are the palatine tonsils?
- E
- F
- R
- U
- None of the above
Correct Answer

A. R

Explanation

The palatine tonsils are located in the back of the throat on either side of the uvula. They are part of the lymphatic system and play a role in immune function by helping to filter out harmful substances and pathogens that enter the body through the mouth and nose.

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41.

Where is the right bronchiole?
- F
- G
- H
- L
- M
Correct Answer

A. G

Explanation

The right bronchiole is located at position G.

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42.

This is direction of diffusion of gases at capillaries near systemic cells.
- Oxygen into blood, carbon dioxide into blood
- Oxygen out of blood, carbon dioxide into blood
- Oxygen into blood, carbon dioxide out of blood
- Oxygen out of blood, carbon dioxide out of blood
Correct Answer

A. Oxygen out of blood, carbon dioxide into blood

Explanation

The correct answer is "Oxygen out of blood, carbon dioxide into blood." This is because at the capillaries near systemic cells, oxygen diffuses out of the blood and into the cells where it is needed for cellular respiration. On the other hand, carbon dioxide, which is a waste product of cellular respiration, diffuses out of the cells and into the blood to be transported back to the lungs for exhalation.

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43.

Which is a factor that does NOT affect haemoglobin's affinity for oxygen?
- PH of blood
- Partial pressure of the oxygen
- Amount of oxygen available
- Temperature
- Repiratory rate
Correct Answer

A. Repiratory rate

Explanation

The respiratory rate is not a factor that affects hemoglobin's affinity for oxygen. Hemoglobin's affinity for oxygen is primarily influenced by factors such as pH of blood, partial pressure of oxygen, amount of oxygen available, and temperature. The respiratory rate, which refers to the number of breaths taken per minute, is not directly related to hemoglobin's affinity for oxygen.

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44.

Where is the larynx?
- I
- M
- L
- N
- O
Correct Answer

A. I

Explanation

The larynx is located in the upper part of the neck, between the base of the tongue and the trachea. It is commonly referred to as the voice box and plays a crucial role in producing sound and allowing air to pass through the vocal cords.

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45.

What is C pointing to?
- Terminal bronchiole
- Respiratory bronchiole
- Alveolar ducts
- Alveolar sac
- Alveoli
Correct Answer

A. Alveolar ducts

Explanation

C is pointing to the structure known as alveolar ducts. Alveolar ducts are small airways in the lungs that connect the respiratory bronchioles to the alveolar sacs. They are lined with smooth muscle and contain numerous tiny air sacs called alveoli, where gas exchange takes place. Alveolar ducts play a crucial role in delivering air to the alveoli, allowing for efficient oxygenation of the blood and removal of carbon dioxide.

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46.

Where are the olfactory receptors found?
- A
- B
- C
- D
- U
Correct Answer

A. B

Explanation

The olfactory receptors are found in the nasal cavity, specifically in the olfactory epithelium, which lines the upper part of the nasal cavity. These receptors are responsible for detecting and transmitting signals related to smell to the brain.

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47.

When blood pH drops then the amount of oxyhaemoglobin ______________ and oxygen delivery to the tissue cells ___________.
- Increases, increases
- Increases, decreases
- Decreases, increases
- Decreases, decreases
- Does not change, does not change
Correct Answer

A. Decreases, increases

Explanation

When blood pH drops, it means that the blood becomes more acidic. In this case, the amount of oxyhaemoglobin decreases. This is because a decrease in pH causes haemoglobin to release oxygen more readily, resulting in less oxyhaemoglobin in the blood. However, the decrease in oxyhaemoglobin actually leads to an increase in oxygen delivery to the tissue cells. This is because the decrease in oxyhaemoglobin prompts a higher release of oxygen to the tissues, compensating for the lower amount of oxyhaemoglobin.

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48.

What is line D pointing to?
- Thyrohyoid membrane
- Corniculate cartilage
- Cricothyroid ligament
- Cricoid cartilage
- Tracheal cartilage
Correct Answer

A. Corniculate cartilage

Explanation

Line D is pointing to the corniculate cartilage. The corniculate cartilage is a small, horn-shaped structure that sits on top of the arytenoid cartilage in the larynx. It helps to support the vocal folds and plays a role in controlling the tension and position of the vocal cords during speech and breathing.

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49.

Where is the structure that regulates air flow to the alveolus?
- G
- M
- H
- A
- None of the above
Correct Answer

A. M

Explanation

The structure that regulates air flow to the alveolus is located in option M.

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