Question 1

Which of the following best describes pulmonary ventilation?

Accepted Answer

The process of moving air into and out of the lungs to allow gas exchange.

Question 2

During inspiration, which muscle actions contribute to the expansion of the thoracic cavity?

Accepted Answer

Diaphragm contracts and external intercostal muscles contract.

Question 3

What happens to air pressure inside the lungs during inspiration?

Accepted Answer

It decreases below atmospheric pressure.

Question 4

Which of the following events occurs during expiration?

Accepted Answer

Diaphragm relaxes and moves upward.

Question 5

If the thoracic cavity volume decreases, what is the effect on air pressure inside the lungs?

Accepted Answer

Air pressure inside the lungs increases.

Question 6

Which equation best represents the relationship between pressure and volume in pulmonary ventilation?

Accepted Answer

$$P 	imes V = k$$

Question 7

A patient has difficulty exhaling air from the lungs. Which of the following is most likely impaired?

Accepted Answer

Relaxation of the diaphragm.

Question 8

During a forceful expiration, which muscles are additionally recruited?

Accepted Answer

Internal intercostal muscles.

Question 9

Which of the following best explains why air flows into the lungs during inspiration?

Accepted Answer

Air pressure inside the lungs becomes lower than atmospheric pressure.

Question 10

A person is stabbed in the chest, causing a pneumothorax (collapsed lung). Which mechanism of pulmonary ventilation is directly disrupted?

Accepted Answer

The pressure gradient between the lungs and atmosphere.

Question 11

Which of the following changes would most likely increase the rate of pulmonary ventilation?

Accepted Answer

Increased contraction of the diaphragm and external intercostal muscles.

Question 12

If a person’s thoracic cavity cannot expand properly, which phase of pulmonary ventilation is most affected?

Accepted Answer

Inspiration.

Question 13

Which of the following is a direct result of the diaphragm flattening during inspiration?

Accepted Answer

Increase in thoracic cavity volume.

Question 14

A patient with a spinal cord injury at the level of the phrenic nerve would have difficulty with which aspect of pulmonary ventilation?

Accepted Answer

Contracting the diaphragm during inspiration.

Question 15

Which of the following best describes the pressure changes during expiration?

Accepted Answer

Air pressure inside the lungs increases above atmospheric pressure.

Question 16

Which formula can be used to calculate the change in pressure during pulmonary ventilation if volume changes from $$V_1 to$$ $$V_2$$ and initial pressure is $$P_1$$?

Accepted Answer

$$P_2$$ = \frac{$$P_1$$ 	imes $$V_1$$}{$$V_2$$}$$

Question 17

Which of the following would most likely occur if the external intercostal muscles failed to contract during inspiration?

Accepted Answer

Thoracic cavity would not expand fully, reducing air intake.

Question 18

During normal breathing, which sequence of events occurs during inspiration?

Accepted Answer

Diaphragm contracts, thoracic cavity volume increases, air enters lungs.

Question 19

Which of the following is the primary driving force for air movement during pulmonary ventilation?

Accepted Answer

Pressure gradient between atmospheric and intrapulmonary pressure.

Question 20

A patient is unable to relax their diaphragm after inspiration. What is the most likely consequence?

Accepted Answer

Air pressure inside the lungs will remain low, making expiration difficult.

Pulmonary Ventilation: Mechanisms and Processes

Study Guide - Practice Questions

Study Guide - Flashcards