Which of the Following Occurs on Inhalation

Question

Which of the following occurs on inhalation?
A) Air moves into the intrapulmonic space.
B) Thoracic volume increases.
C) The diaphragm contracts.
D) All of the above occur.

Accepted Answer

All of the above occur during inhalation. Air moves into the intrapulmonic space, which is the space within the lungs, due to the decrease in pressure created by the expansion of the thoracic cavity. The thoracic volume increases as the rib cage and diaphragm expand to take in air. The diaphragm contracts, flattening and lowering to increase the space in the thoracic cavity.