1. What is the main function of the respiratory system?

a) To transport oxygen and carbon dioxide between the lungs and the

tissues

b) To filter and humidify the air that enters the body

c) To regulate the pH of the blood and body fluids

d) All of the above

Answer: D. All of the above are functions of the respiratory system.

2. What is the term for the volume of air that remains in the lungs after a

normal expiration?

a) Residual volume

b) Tidal volume

c) Functional residual capacity

d) Vital capacity

Answer: C. Functional residual capacity is the volume of air that remains

in the lungs after a normal expiration. Residual volume is the volume of

air that remains in the lungs after a maximal expiration. Tidal volume is

the volume of air that is inhaled or exhaled during a normal breath. Vital

capacity is the maximum volume of air that can be exhaled after a

maximal inspiration.

3. What is the name of the structure that divides the nasal cavity into two

halves?

a) Nasal septum

b) Nasal concha

c) Nasal meatus

d) Nasal vestibule

Answer: A. Nasal septum is the structure that divides the nasal cavity into

two halves. Nasal concha are the curved bones that project from the lateral

walls of the nasal cavity and create air turbulence. Nasal meatus are the

narrow passages between the nasal concha. Nasal vestibule is the anterior

part of the nasal cavity that opens to the external environment.

4. What is the term for the movement of air into and out of the lungs?

a) Ventilation

b) Respiration

c) Diffusion