Question 1

Which of the following best describes the function of Type II alveolar cells in the lungs?

Accepted Answer

They secrete surfactant to reduce surface tension and prevent alveolar collapse.

Question 2

A patient with pneumonia has fluid accumulation in the alveoli, increasing the thickness of the respiratory membrane. Which of the following best explains the effect on gas exchange?

Accepted Answer

Gas exchange is impaired because diffusion distance is increased.

Question 3

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

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 4

During inspiration, which of the following events occurs?

Accepted Answer

Intrapulmonary pressure drops below atmospheric pressure.

Question 5

Which structure acts as a switching mechanism to separate food and air and is also involved in voice production?

Accepted Answer

Larynx

Question 6

A person is exposed to high levels of carbon dioxide. What is the immediate effect on their respiratory rate, and which chemoreceptors are primarily responsible?

Accepted Answer

Respiratory rate increases; central chemoreceptors

Question 7

Which of the following best describes the Bohr effect?

Accepted Answer

Oxygen binding affinity to hemoglobin increases with higher pH and lower CO2.

Question 8

Which of the following is the correct formula for calculating Vital Capacity (VC)?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 9

Which of the following changes occurs as air moves from the trachea to the alveoli?

Accepted Answer

The epithelium changes from pseudostratified ciliated columnar to simple squamous.

Question 10

A patient with emphysema has reduced alveolar surface area. What is the most likely consequence?

Accepted Answer

Decreased diffusion of gases, leading to oxygen deprivation.

Question 11

Which of the following best describes the chloride shift in carbon dioxide transport?

Accepted Answer

Chloride ions move into red blood cells as bicarbonate ions move out.

Question 12

Which of the following is NOT a function of the nose?

Accepted Answer

Gas exchange with blood

Question 13

Which of the following best explains why surfactant is critical for normal lung function?

Accepted Answer

It reduces surface tension, preventing alveolar collapse.

Question 14

Which of the following is the correct sequence of airflow during inhalation?

Accepted Answer

Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 15

Which of the following best describes the role of the pleural fluid?

Accepted Answer

It reduces friction and allows free movement of the lungs.

Question 16

A person forcefully exhales after a normal tidal expiration. Which lung volume is being measured?

Accepted Answer

Expiratory reserve volume

Question 17

Which of the following is the primary factor that determines the direction of gas movement across the respiratory membrane?

Accepted Answer

Partial pressure gradients of the gases

Question 18

Which of the following is the correct formula for calculating Total Lung Capacity (TLC)?

Accepted Answer

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

Question 19

Which of the following best describes the effect of increased temperature on oxygen release from hemoglobin?

Accepted Answer

It increases oxygen release from hemoglobin.

Question 20

Which of the following is the main site of gas exchange in the lungs?

Accepted Answer

Alveoli

The Respiratory System: Structure, Function, and Physiology

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