Question 1

Which of the following structures is the primary site of gas exchange in the lungs?

Accepted Answer

Alveoli

Question 2

During inspiration, which of the following events occurs first?

Accepted Answer

Inspiratory muscles contract

Question 3

Which equation correctly represents the calculation for vital capacity (VC)?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 4

A patient with a history of smoking presents with labored breathing, frequent infections, and a chronic productive cough. Which condition is most likely?

Accepted Answer

Chronic bronchitis

Question 5

Which of the following best describes the function of surfactant in the alveoli?

Accepted Answer

Reduces surface tension and prevents alveolar collapse

Question 6

If the intrapleural pressure ($$P_{ip}) $$equals the intrapulmonary pressure ($$P_{pul}$$), what is the likely outcome?

Accepted Answer

Lungs collapse

Question 7

Which of the following is a characteristic of obstructive pulmonary disease?

Accepted Answer

Increased airway resistance

Question 8

A climber rapidly ascends to an altitude above 8000 feet and experiences headache, nausea, and dizziness. What is the most likely explanation for these symptoms?

Accepted Answer

Acute mountain sickness due to decreased atmospheric $$P_{O_2$}$$

Question 9

Which of the following best describes the relationship between pressure and volume during pulmonary ventilation?

Accepted Answer

As thoracic volume increases, intrapulmonary pressure decreases

Question 10

Which of the following is the correct formula for total lung capacity (TLC)?

Accepted Answer

$$TLC = TV + IRV + ERV + RV$$

Question 11

A patient is diagnosed with emphysema. Which of the following changes would you expect in their lungs?

Accepted Answer

Destruction of alveolar walls and loss of lung elasticity

Question 12

Which of the following is a direct result of hyperventilation?

Accepted Answer

Decreased $$P_{CO_2$} in $$the blood (hypocapnia)

Question 13

Which of the following is the main driving force for gas exchange across the respiratory membrane?

Accepted Answer

Partial pressure gradients of O2 and CO2

Question 14

Which of the following best describes the effect of decreased lung compliance?

Accepted Answer

Lungs are more difficult to expand

Question 15

A patient with cystic fibrosis has thick, viscous mucus in the lungs. Which of the following is a likely consequence?

Accepted Answer

Frequent respiratory infections

Question 16

Which of the following is true regarding the control of breathing?

Accepted Answer

The medulla and pons regulate the rhythm and depth of breathing

Question 17

Which of the following best explains why a person may faint after hyperventilating?

Accepted Answer

Cerebral vasoconstriction due to low $$P_{CO_2$}$$

Question 18

Which of the following is a common feature of all types of lung cancer?

Accepted Answer

Strong association with smoking

Question 19

Which of the following best describes the effect of a decrease in arterial $$P_{O_2$}$$ below 60 mm Hg?

Accepted Answer

It stimulates increased ventilation

Question 20

A scuba diver ascends too quickly and develops joint pain and dizziness. What is the most likely physiological cause?

Accepted Answer

Nitrogen bubbles forming in the blood (the bends)

The Respiratory System: Structure, Function, and Regulation

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