Respiratory System 2
Inspiration, or
"breathing in", is the expansion of the lungs through
contraction of the diaphragm muscle causing air to be
brought into the lungs. Expiration,
or "breathing out", is the relaxation of the
diaphragm muscle causing air to be expelled from the
lungs. Gas exchange occurs in three steps: between the
air and the lungs, between the lungs and the blood and
between the blood and the cells.
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