Diaphragm

From Simple English Wikipedia, the free encyclopedia

The diaphragm is a muscle that is at the bottom of the ribcage of mammals.

[edit] What it does

When breathing in, the diaphragm pulls down so that the size of the lungs increases. When breathing out, the diaphragm rests and goes up making a dome shape, decreasing the size of the lungs and pushing air out.

[edit] See also