$$\mathrm{O}_2~(\text{alveoli}) \rightarrow \mathrm{O}_2~(\text{blood})$$

$$\mathrm{CO}_2~(\text{body tissues}) \rightarrow \mathrm{CO}_2~(\text{blood})$$

Question 1

Which of the following best describes the process of external respiration in the respiratory system?

Accepted Answer

Exchange of respiratory gases between the blood and the lungs

Question 2

A patient with cystic fibrosis has defective chloride channels in the respiratory tract. What is the primary consequence of this defect?

Accepted Answer

Thick, immobile mucus that blocks the respiratory tract

Question 3

Which structure is responsible for preventing ingested materials from entering the respiratory tract during swallowing?

Accepted Answer

Epiglottis

Question 4

During a severe asthma attack, which autonomic nervous system response would help alleviate bronchoconstriction?

Accepted Answer

Sympathetic stimulation from T1-T5 causing bronchodilation

Question 5

Which of the following equations correctly represents the diffusion of oxygen from alveoli into blood?

Accepted Answer

$$\mathrm{O}_2~(	ext{alveoli}) ightarrow \mathrm{O}_2~(	ext{blood})$$

Question 6

A patient presents with severe chest pain during breathing and only one side of the chest is affected. Which condition is most likely responsible?

Accepted Answer

Pleurisy

Question 7

Which of the following best explains why the right main bronchus is more likely to lodge foreign objects than the left?

Accepted Answer

It is shorter, wider, and more vertically oriented

Question 8

Which cell type in the alveoli is primarily responsible for secreting pulmonary surfactant?

Accepted Answer

Alveolar type II cells

Question 9

A patient with chronic bronchitis is at increased risk for which of the following complications?

Accepted Answer

Permanent changes to bronchi and increased risk of future bacterial infections

Question 10

Which of the following best describes the function of the serous fluid in the pleural cavity?

Accepted Answer

It lubricates the pleural layers, allowing them to slide past each other with minimal friction

Question 11

Which equation best represents the movement of carbon dioxide during internal respiration?

Accepted Answer

$$\mathrm{CO}_2~(	ext{body tissues}) ightarrow \mathrm{CO}_2~(	ext{blood})$$

Question 12

Which anatomical feature allows for equalization of pressure on each side of the tympanic membrane?

Accepted Answer

Auditory (eustachian) tube

Question 13

A patient is unable to produce sound due to inflammation of the larynx. What is the most likely diagnosis?

Accepted Answer

Laryngitis

Question 14

Which of the following structures is NOT part of the conducting zone of the respiratory system?

Accepted Answer

Alveoli

Question 15

Which equation best represents the total surface area available for gas exchange in the alveoli?

Accepted Answer

$$100~\mathrm{m}^2$$

Question 16

Which of the following is a function of the mucous secretions produced by goblet cells in the respiratory tract?

Accepted Answer

Increase the viscosity of mucus and trap potential pathogens

Question 17

A patient with pneumonia has alveoli filled with fluid and pus. Which of the following symptoms is most likely to occur?

Accepted Answer

Difficulty breathing and chest pain while inhaling

Question 18

Which of the following best describes the role of alveolar macrophages?

Accepted Answer

Engulf microorganisms and debris in the alveoli

Question 19

Which anatomical feature divides the nasal cavity into separate passages and increases turbulence of inhaled air?

Accepted Answer

Nasal conchae

Question 20

Which of the following is a direct result of the Valsalva maneuver?

Accepted Answer

Closure of the vocal folds and contraction of abdominal muscles

Respiratory System: Structure, Function, and Clinical Relevance

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