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The respiratory system supplies the body with
oxygen, Air is inhaled through the nose or mouth. It then travels into the
pharynx, passes through the larynx, and down the trachea. The trachea branch and air
reaches the lungs where it will diffuse into the blood via the alveoli. The bloodstream
then carries the blood throughout the body (see
cardiovascular). After oxygen has diffused the diaphragm forces the air back out
of the lungs, and it exits the body through the same path it traveled in as carbon
dioxide.
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