Question 1

Which of the following structures is responsible for filtering, warming, and moistening air before it enters the lower respiratory tract?

Accepted Answer

Nasal cavity

Question 2

A patient suffers damage to the epiglottis. What is the most likely consequence?

Accepted Answer

Food entering the trachea during swallowing

Question 3

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

Accepted Answer

Serving as the primary site for gas exchange between air and blood

Question 4

A person inhales deeply. Which muscles are primarily responsible for this action?

Accepted Answer

Diaphragm and external intercostal muscles

Question 5

Which of the following equations correctly represents the relationship between pressure and volume in the lungs during breathing (Boyle's Law)?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 6

A patient with pneumonia has fluid accumulation in the alveoli. What is the most direct effect on gas exchange?

Accepted Answer

Decreased surface area for gas exchange

Question 7

Which structure prevents the collapse of the trachea during inhalation?

Accepted Answer

C-shaped cartilaginous rings

Question 8

A person is stabbed in the chest, puncturing the pleural cavity. What is the most likely immediate consequence?

Accepted Answer

Pneumothorax (collapsed lung)

Question 9

Which of the following best explains why the left lung has a cardiac notch?

Accepted Answer

To accommodate the position of the heart

Question 10

Which cell type in the respiratory epithelium is primarily responsible for producing mucus?

Accepted Answer

Goblet cells

Question 11

During forced exhalation, which muscles are most active?

Accepted Answer

Internal intercostal and abdominal muscles

Question 12

A patient with chronic bronchitis has excessive mucus production. Which of the following is a likely consequence?

Accepted Answer

Obstruction of the bronchi and reduced gas exchange

Question 13

Which of the following best describes the path of air from the trachea to the alveoli?

Accepted Answer

Trachea → Primary bronchi → Secondary bronchi → Tertiary bronchi → Bronchioles → Alveoli

Question 14

Which of the following is a function of the cilia in the respiratory epithelium?

Accepted Answer

Moving mucus and trapped particles toward the pharynx

Question 15

A patient with emphysema has destruction of alveolar walls. Which of the following best describes the effect on lung function?

Accepted Answer

Decreased elastic recoil and impaired gas exchange

Question 16

Which of the following best explains why the alveolar walls must remain moist?

Accepted Answer

Moisture increases the diffusion rate of gases

Question 17

Which of the following is the correct formula for calculating the partial pressure of a gas in a mixture?

Accepted Answer

$$P_{gas} = P_{total} 	imes F_{gas}$$

Question 18

Which of the following best describes the difference between the right and left lungs?

Accepted Answer

The right lung has three lobes, the left lung has two

Question 19

A patient is unable to speak after a neck injury. Which structure is most likely damaged?

Accepted Answer

Larynx

Question 20

Which of the following best explains the role of surfactant in the alveoli?

Accepted Answer

It decreases surface tension, preventing alveolar collapse

The Respiratory System: Structure and Function

Study Guide - Practice Questions