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what happen to diaphram when intercoastal muscles co
ntract

When we breathe in air, the size of our chest cavity increases.This happens because when air enters the lungs, they expand and the inter coastal muscles contract by which ribs move outwards. Simultaneously, the diaphragm contracts and becomes flat. Thus, when the inter coastal muscles between ribs contract, the diaphragm also contracts and becomes flat. 

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When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the chest cavity.

As the space in the chest cavity gets smaller, air rich in carbon dioxide is forced out of your lungs and windpipe, and then out of your nose or mouth.

Breathing out requires no effort from your body unless you have a lung disease or are doing physical activity. When you're physically active, your abdominal muscles contract and push your diaphragm against your lungs even more than usual. This rapidly pushes air out of your lungs.


Hope it helps....

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