Question

when diaphram expands ,----- lungs up and air -------lungs
shot answer​

Answer 1

Answer:

When you breathe in by enlarging the chest cage, the "balloons" expand as air rushes in to fill the vacuum. When you breathe out, the "balloons" relax and air moves out of the lungs. Tiny blood vessels surround each of the 300 million alveoli in the lungs.

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