The Diaphragm

Question

The diaphragm
A) is the chief muscle of inhalation.
B) is innervated by the phrenic nerve.
C) increases thoracic volume when contracted.
D) All of the above are true.

Accepted Answer

All of the options are true. The diaphragm is the main muscle of inhalation and is innervated by the phrenic nerve. Contraction of the diaphragm increases the volume of the thoracic cavity, leading to inhalation.