Question

Arrange the given steps of expiration in the sequence of event occurring first.
I. Relaxation of the diaphragm and sternum.
II. Reduction of the pulmonary volume.
III. Expulsion of air from the lungs.
IV. Increase in intrapulmonary pressure.
Choose the correct option.

• A. $I \rightarrow II \rightarrow III \rightarrow IV$
• B. $I \rightarrow II \rightarrow IV \rightarrow III$
• C. $IV \rightarrow III \rightarrow II \rightarrow I$
• D. $IV \rightarrow II \rightarrow III \rightarrow I$

Answer 1

Answer: (B)

Correct answer is (b) $I \rightarrow II \rightarrow IV \rightarrow III$