Which event occurs first?
A)The diaphragm contracts.
B)Air moves into the lungs.
C)The phrenic nerve fires.
D)The inspiratory neurons in the medulla fire.

Question

Quizplus · Accepted Answer

The firing of inspiratory neurons in the medulla is the first event that triggers the breathing process. It then leads to the firing of the phrenic nerve, which in turn causes the diaphragm to contract and subsequently allows air to move into the lungs.

Which Event Occurs First