What is the "advantage" of increase in the volume of chest cavity as well as decrease in the volume of chest cavity?
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The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest. It contracts and flattens when you inhale. This creates a vacuum effect that pulls air into the lungs. When you exhale, the diaphragm relaxes and the air is pushed out of lungs.
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Explanation:
It is so because when the volume of chest cavity increases the foul air that is carbon dioxide goes out from our body through the lungs but when it decreases or expands the air that is Oxygen comes in our body through lungs
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