Which of following statements regarding the action of the diaphragm is not true?
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
Explanation: Air flows into the lungs with inhalation, not exhalation. The other statements are true.
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