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Question

Oxygen moves from the lungs into the bloodstream through

A
small blood vessels in the lungs
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B
lymphatic veins
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C
a large artery in the heart
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D
blood vessels in the bronchi
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Solution

The correct option is A small blood vessels in the lungs
Within each lung, gaseous exchange occurs in the alveoli. The alveoli are richly supplied with blood capillaries. Oxygen from the alveoli diffuse into the bloodstream, and carbon dioxide from the blood enter the alveoli, to be eliminated by exhalation.

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