Question

which of the following accurately describes tidal volume?

a.) the varying amounts of air within the lung at a given time.

b.) the air space present in the airway that never reaches the alveoli and therefore never participates in gas exchange.

c.) the amount of air that can be forcefully exhaled after a normal exhalation.

d.) the amount of air that normally enters the lungs during quiet breathing

Explanation:

Tidal volume is defined as the amount of air that normally enters the lungs during quiet breathing. Option a is incorrect as it is too vague. Option b describes anatomical dead space. Option c describes expiratory reserve volume.

Answer:

d. The amount of air that normally enters the lungs during quiet breathing.