What happens if the diaphragm is not there in the body?


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Shinypate one answered

The diaphragm works to expand and contract the volume the lungs occupy, thus causing respiration via negative pressure.

To demonstrate it's action, imagine a cylinder with a balloon at the bottom. If you pull on the balloon, the cylinder holds more air, and if you push in, it holds less.

Without a diaphragm, you would only be able to do costal breathing, a very inefficient method and one which is much more work. Birds and reptiles can do this, but humans need more oxygen for their bigger brain.

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