Which of the following actions does not occur during exhalation in man?

A. Thoracic cavity decreases in volume
B. Diaphragm flattens
C. Ribs move down and in
D. Air pressure increases in the thoracic cavity

Correct Answer: Option B

B. Diaphragm flattens

Explanation

When you breathe in, or inhale, your diaphragm tightens and moves downward (flattens).