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Question

What happens when we exhale (breath out)?



A

The diaphragm contracts and moves upwards

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B

The diaphragm relaxes and moves upwards

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C

The diaphragm relaxes and moves downwards

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D

None of these

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Solution

The correct option is B

The diaphragm relaxes and moves upwards


When we exhale, the diaphragm relaxes and moves upwards. This helps to reduce the volume in the thorax and push air out of the lungs. When the diaphragm contracts, it moves downwards not upwards.


Biology

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