Oxygen enters the bloodstream primarily in the alveoli. The alveoli are tiny air sacs in the lungs where gas exchange occurs; oxygen from the air inside the alveoli diffuses into the blood in the surrounding capillaries, while carbon dioxide from the blood is expelled into the alveoli to be exhaled.
Oxygen enters the bloodline in the
Bronchi
Pharynx
Larynx
Alveoli
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