WAEC - Biology (2017 - No. 11)
Which of the following actions does not occur during exhalation in man?
Thoracic cavity decreases in volume
Diaphragm flattens
Ribs move down and in
Air pressure increases in the thoracic cavity
Giải thích
When you breathe in, or inhale, your diaphragm tightens and moves downward (flattens).