Question 1

Which of the following best describes the primary function of the upper respiratory system?

Accepted Answer

It warms, humidifies, and filters incoming air before it reaches the lower respiratory tract.

Question 2

A patient suffers a stab wound that punctures the parietal pleura but not the visceral pleura. Which of the following is the most likely immediate consequence?

Accepted Answer

Air will enter the pleural cavity, potentially causing lung collapse.

Question 3

Which equation correctly represents Boyle's Law as it applies to pulmonary ventilation?

Accepted Answer

$P_1 V_1 = P_2 V_2$

Question 4

During forced expiration, which muscles contract to decrease thoracic volume?

Accepted Answer

Internal intercostals and abdominal muscles

Question 5

A person inhales deeply, increasing the volume of their thoracic cavity. According to Boyle's Law, what happens to the intrapulmonary pressure ($P_{pul}$)?

Accepted Answer

$P_{pul}$ decreases below atmospheric pressure

Question 6

Which of the following best explains why oxygen diffuses from alveoli into pulmonary capillaries?

Accepted Answer

The partial pressure of oxygen ($P_{O_2}$) is higher in alveoli than in blood.

Question 7

Which of the following is NOT a function of surfactant in the alveoli?

Accepted Answer

Facilitating gas exchange by increasing diffusion distance

Question 8

A patient with emphysema has damaged alveolar walls, resulting in fewer but larger alveoli. Which of the following best explains why this impairs gas exchange?

Accepted Answer

The total surface area for diffusion is decreased.

Question 9

Which of the following correctly describes the majority of carbon dioxide transport in the blood?

Accepted Answer

Converted to bicarbonate ion ($HCO_3^-$) in red blood cells

Question 10

A rightward shift in the oxygen-hemoglobin dissociation curve (Bohr effect) is most likely caused by which of the following?

Accepted Answer

Increased $CO_2$ and decreased pH

Question 11

Which of the following best describes the role of the ventral respiratory group (VRG) in the brainstem?

Accepted Answer

It sets the basic rhythm of breathing by generating inspiratory and expiratory signals.

Question 12

A patient is exposed to carbon monoxide ($CO$). Which of the following best explains why $CO$ is dangerous?

Accepted Answer

$CO$ binds to hemoglobin with a much higher affinity than $O_2$, preventing oxygen transport.

Question 13

Which of the following is the correct sequence of the four steps of respiration?

Accepted Answer

Pulmonary ventilation, external respiration, transport of gases, internal respiration

Question 14

A person with chronic obstructive pulmonary disease (COPD) is likely to experience which of the following symptoms?

Accepted Answer

Decreased alveolar surface area and difficulty exhaling

Question 15

Which of the following best explains why hyperventilation can lead to respiratory alkalosis?

Accepted Answer

It decreases $CO_2$ levels, raising blood pH.

Question 16

Which of the following would most likely cause bronchodilation?

Accepted Answer

Release of epinephrine from the adrenal medulla

Question 17

Which of the following best describes the effect of 2,3-bisphosphoglycerate (2,3-BPG) on hemoglobin?

Accepted Answer

It decreases hemoglobin's affinity for oxygen, facilitating oxygen release to tissues.

Question 18

A patient with severe pneumonia develops hypoxemia. Which of the following best explains this condition?

Accepted Answer

Increased diffusion distance across the respiratory membrane impairs oxygen uptake.

Question 19

Which of the following is a major difference between COPD and asthma?

Accepted Answer

Asthma is characterized by reversible airway obstruction, while COPD is not fully reversible.

Chapter 22: The Respiratory System – Structure, Function, and Clinical Relevance

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