HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Respiratory System 2

OLYMPIC RUNNING
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. [CG] {NR}

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