$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

$$P_{O_2$,\text{alveoli}} \u003e P_{O_2$,\text{blood}}$$

Question 1

Which of the following best describes the primary function of Type I alveolar cells in the respiratory system?

Accepted Answer

Gas exchange between air and blood

Question 2

During external respiration, which process is responsible for the movement of oxygen from alveoli into the blood?

Accepted Answer

Diffusion

Question 3

A patient with damage to their ciliated cells in the trachea is likely to experience which of the following symptoms?

Accepted Answer

Increased risk of respiratory infections due to impaired mucus clearance

Question 4

Which equation best represents the process of aerobic cellular respiration occurring during internal respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 5

Which structure is NOT part of the conducting zone of the respiratory tract?

Accepted Answer

Alveoli

Question 6

The respiratory membrane is optimized for gas exchange because it is:

Accepted Answer

Highly vascularized and approximately $$0.2\ \mu\mathrm{m}$$ thick

Question 7

Which of the following is a function of the pleural sac surrounding each lung?

Accepted Answer

Provides airtight protection and reduces friction during breathing

Question 8

A person inhales cold, dry air. Which function of the conducting zone helps protect the delicate tissues of the respiratory zone?

Accepted Answer

Humidification and warming of air

Question 9

Which of the following best explains why the alveolar surface area is so large in the human lungs?

Accepted Answer

To maximize the rate of gas exchange by increasing the area for diffusion

Question 10

Which of the following is a direct consequence of impaired surfactant production by Type II alveolar cells?

Accepted Answer

Increased surface tension leading to alveolar collapse (atelectasis)

Question 11

Which equation describes the partial pressure gradient driving oxygen diffusion from alveoli to blood?

Accepted Answer

$$P_{O_2$,	ext{alveoli}} \u003e P_{O_2$,	ext{blood}}$$

Question 12

Which anatomical feature distinguishes bronchioles from bronchi?

Accepted Answer

Absence of cartilage and diameter less than 1 mm

Question 13

A patient with a blocked alveolar pore would most likely experience which physiological consequence?

Accepted Answer

Reduced pressure equilibration between adjacent alveoli

Question 14

Which of the following is NOT a function of the respiratory system?

Accepted Answer

Production of red blood cells

Question 15

Which structure forms the airtight barrier that protects the lungs within the thoracic cavity?

Accepted Answer

Pleural sac

Question 16

Which of the following best describes the role of alveolar macrophages?

Accepted Answer

Engulf and remove pathogens and debris from the alveolar space

Question 17

If the volume of the conducting zone is 150 mL, what is the physiological significance of this 'dead space'?

Accepted Answer

It is the volume of air that does not participate in gas exchange

Question 18

Which of the following structures is responsible for the bulk flow of air during pulmonary ventilation?

Accepted Answer

Trachea and bronchi

Question 19

Which of the following best explains the importance of the thinness of the respiratory membrane?

Accepted Answer

It allows for rapid diffusion of gases between air and blood

The Respiratory System: Pulmonary Ventilation – Structure and Function

Study Guide - Practice Questions