What forces must be overcome to move air into the respiratory system? 1. Tissue movement 2. Elastic forces of lung tissue 3. Airway resistance 4. Surface tension forces
a. 1, 2, and 3 only
b. 2 and 4 only
c. 4 only
d. 1, 2, 3, and 4
ANS: D
Elastic forces involve the tissues of the lungs and thorax, along with surface tension in the alveo-li. Frictional forces include resistance caused by gas flow and tissue movement during breathing.
Health Professions
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