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Question

The most powerful respiratory stimulus for breathing in a healthy person is


A

Loss of oxygen in tissues

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B

Increase of carbon dioxide in tissues

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C

pH (acidosis)

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D

pH (alkalosis)

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Solution

The correct option is B

Increase of carbon dioxide in tissues


An increase in the accumulation of carbon dioxide in the tissues means less availability of oxygen for cellular respiration. This serves as a powerful stimulus for breathing.

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