Which Off the following facilitates the filling of the lungs with air? a. Relaxation of the...
Which Off the following facilitates the filling of the lungs with air?
a. Relaxation of the smooth muscle in the lung
b. Negative pressure created by the diaphragm pulling on the pleurae
c. Concentration gradient of O2 and Co2 between the atmosphere and the lung
d. Expansion of the alveolar sacs
Homework Answers
AMSWER: b. Negative pressure created by the diaphragm pulling on the pleurae.
Reason: During inspiration, the muscles on the ribs and the diaphragm contract creating a negative pressure which would allow the air to enter into the lungs.
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