Which of the following does not occur when air enters the lungs?
A) Thoracic pressure decreases.
B) The diaphragm flattens.
C) The diaphragm relaxes.
D) The intercostal muscles raise the ribs.
E) The amount of space in the thoracic cavity increases.

Question

Quizplus · Accepted Answer

During inhalation, the diaphragm contracts and flattens, not relaxes. Relaxation of the diaphragm occurs during exhalation, not inhalation.

Which of the Following Does Not Occur When Air Enters