Question

which of following statements about the process of respiration is false?
a when the diaphragm contracts, it moves downward.
b the intercostal muscles assist inhalation by raising the rib cage.
c air flows into the lungs with exhalation.
d a quiet, unforced exhalation is a passive process because it does not require any muscle contraction.

Explanation:

During exhalation, air flows out of the lungs, not into them. When the diaphragm contracts, it moves downward to increase thoracic volume for inhalation. Inter - costal muscles raise the rib cage during inhalation. Quiet, unforced exhalation is passive as it relies on the elastic recoil of the lungs and thoracic tissues without muscle contraction.

Answer:

C. Air flows into the lungs with exhalation.