Which of the Following is the First Step in Inhalation

Question

Which of the following is the first step in inhalation?
A) Phrenic nerve stimulation
B) Activation of the NM receptors (neuromuscular junction of the phrenic nerve and diaphragm)
C) Firing of the medullary inspiratory neurons
D) Contraction of the diaphragm

Accepted Answer

Firing of the medullary inspiratory neurons is the first step in inhalation, as it triggers the respiratory muscles to contract and initiate the breathing process.