Why is inhalation described as an active process?
A) It requires the diaphragm to relax and use energy to move, creating a positive pressure.
B) It requires chest muscles to relax and use energy to move, creating a positive pressure.
C) It requires chest muscles to contract and use energy to move, creating a negative pressure.
D) It uses oxygen to assist chest muscles to contract, creating a negative pressure.

Question

Quizplus · Accepted Answer

Inhalation is an active process because it requires chest muscles to contract and use energy to move, creating a negative pressure. This negative pressure allows air to enter the lungs, and it is the active effort of the body that creates this pressure. Option A is incorrect because the diaphragm contracts during inhalation, not relaxes. Option B is incorrect because the role of chest muscles during inhalation is to expand, not contract. Option D is incorrect because oxygen does not assist with chest muscle contractions during inhalation.

Why Is Inhalation Described as an Active Process