Breathing movements

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Breathing in and out

The diaphragm, a large muscle below the lungs, is responsible for causing the otherwise passive lungs to expand amd contract during breathing. As the diaphragm moves down, it creates a lower pressure ("vacuum") above it, so the air rushes in and the lungs expand to fill the "vacuum". As the diaphragm moves upward, it then pushes the air out of the lungs. The intercostals are long belt shaped muscles that form thin sheets of muscles weaved between the bones of the rib cage. They are your breathing muscles. As they contract, they pull the ribs up to expand the chest with every breath. This creates a "vacuum", and the air fills the lungs.

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Stand: 06. Juli 2005.