Biology of Humans 6th Edition by Judith Goodenough,Betty McGuire

تمرين 14

Choose the correct statement.
a. During quiet breathing, expiration does not usually involve the contraction of muscles.
b. Expiration occurs when the diaphragm and the rib muscles contract.
c. Expiration occurs as the chest (thoracic) cavity enlarges.
d. The larynx acts like a suction pump to pull air into the lungs.