One of the functions of the pulmonary system is the:
a. expelling of bacteria.
b. exchange of gases between the environ-ment and blood.
c. movement of blood into and out of the capillaries.
d. principal mechanism for cooling of the heart.
ANS: B
The pulmonary system promotes exchange of gases between the environment and the blood. Neither expelling bacteria, moving blood in and out of the capillaries, nor cooling of the heart is considered a function of the pulmonary system.
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