Which Statement About Respiration is True

Question

Which statement about respiration is true?
A) Inhalation is a passive process.
B) Exhalation is an active process during intense exercise.
C) During exhalation, the pressure in the lung decreases.
D) During inhalation, the diaphragm relaxes.

Accepted Answer

During intense exercise, exhalation becomes an active process as the body expels more carbon dioxide and the demand for oxygen increases. The other statements are incorrect. Inhalation is an active process and exhalation is a passive process. During exhalation, the pressure in the lung increases as the diaphragm and rib muscles relax, pushing air out. During inhalation, the diaphragm contracts and moves downwards.