Inspiration:
In order for inspiration to occur the intercostal muscles and the diaphragm contract. First the intercostal muscles contract causing the ribs to elevate and increase the dimension of thoracic cavity. Then the air pressure in the lungs become lower and the air moves into the lungs. In order for the diaphragm to contract the diaphragm moves down.
Expiration:
The process of expiration occurs when intercostal muscles and the diaphragm relax causing the ribs to relax. Then the volume of the thoracic cavity and the pressure in the lungs decreases while air is exhaled.
What causes the lung to inflate with air?
This process is inflation which is caused when ones chest moves up due to the contraction of the thoracic cavity. Ones lungs inflate with oxygen when you breathe which causes them to expand and your chest expands as well.
Why do they deflate?
This process is called deflation and is caused when your diaphragm and intercostal muscles relax.
What part of the process requires a "muscle contraction' of the diaphragm?
Inhalation
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