Question

explain the role of diaphram and the intercostals muscles in the mechanism of respiration and expiration

Answer 1

Diaphragm and intercoastal muscles are the main muscles in the chest cavity which aid in breathing. They work in association with each other to bring about a change in the size of the chest cavity to bring about inhalation and expiration.

Diaphragm when contracts is pulled down and increases the size of the chest cavity bringing about inhalation. The intercoastal muscles move upward and outward. While when it relaxes the chest cavity contracts resulting in expiration. The intercoastal muscles move downwards and inwards. This happens in normal breathing.