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.


C) Air flows into the lungs with exhalation.
Air flows into the lungs with inhalation, not exhalation. The other statements are
true.

Health & Biomechanics

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