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19 December, 17:50

Which of the following occurs in the upper respiratory system?

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  1. 19 December, 18:03
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    Head Area: The nose and mouth take in oxygen that goes through the throat and into the lungs. There are 2 ways, but a little flap opens when oxygen comes in and closes right after. This is used so food doesn't get in the wrong way.

    Chest Area: Capillaries in the lungs move the oxygen to the heart to pump it throughout the body.
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