$$P_{gas} = F_{gas} \times P_{total}$$

Question 1

Which of the following best describes the change in respiratory epithelium from the conducting to the respiratory zones?

Accepted Answer

It transitions from pseudostratified ciliated columnar epithelium to simple squamous epithelium.

Question 2

Which structural feature of the alveoli maximizes gas exchange efficiency?

Accepted Answer

Large surface area and thin walls

Question 3

A patient with chronic bronchitis has excessive mucus production. Which respiratory defense mechanism is most compromised?

Accepted Answer

Mucociliary escalator

Question 4

Which equation correctly represents the relationship between pressure, volume, and airflow in the lungs?

Accepted Answer

$$F = \frac{P_1$ - P_2$}{R}$$

Question 5

During an asthma attack, which physiological change most directly leads to decreased airflow?

Accepted Answer

Constriction of smooth muscle in the bronchioles

Question 6

Which of the following is a primary function of the respiratory system?

Accepted Answer

Gas exchange between air and blood

Question 7

Which of the following best explains why the nasal cavity warms and moistens incoming air?

Accepted Answer

To prevent dehydration of alveolar cells

Question 8

Which of the following would most likely decrease lung compliance?

Accepted Answer

Fibrosis of lung tissue

Question 9

A patient is diagnosed with pneumonia. Which of the following best describes the effect on gas exchange?

Accepted Answer

Increased diffusion distance due to fluid accumulation

Question 10

Which of the following factors would increase oxygen dissociation from hemoglobin?

Accepted Answer

Increased $$pCO_2$$ and decreased pH

Question 11

Where are the neural respiratory control centers located?

Accepted Answer

Medulla oblongata and pons

Question 12

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

Accepted Answer

It decreases surface tension to prevent alveolar collapse.

Question 13

Which of the following equations represents the partial pressure of a gas in a mixture?

Accepted Answer

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

Question 14

Which of the following is NOT a component of the respiratory membrane?

Accepted Answer

Smooth muscle layer

Question 15

A patient with hypercapnia is likely to experience which of the following symptoms?

Accepted Answer

Confusion and headache

Question 16

Which of the following best describes the movement of air into the lungs during inspiration?

Accepted Answer

Air moves in because alveolar pressure is less than atmospheric pressure.

Question 17

Which of the following would most likely result in hypoxemia?

Accepted Answer

Decreased oxygen partial pressure in arterial blood

Question 18

Which of the following statements about gas transport in the blood is correct?

Accepted Answer

Carbon dioxide is primarily transported as bicarbonate ions.

Question 19

Which of the following would most likely increase the work of breathing?

Accepted Answer

Decreased surfactant production

Question 20

Which of the following best explains why carbon monoxide (CO) binding to hemoglobin is dangerous?

Accepted Answer

CO irreversibly binds to hemoglobin, preventing oxygen transport.

Study Guide: The Respiratory System – Structure, Function, and Physiology

Study Guide - Practice Questions