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When you hold your breath, which of ~he ...

When you hold your breath, which of ~he following gas changes in blood would first lead to the urge to breathe?

A

rising `CO_(2)` concentration

B

falling `CO_(2)` concentration

C

rising `CO_(2)`and falling `O_(2)` concentration

D

falling `O_(2)` concentration

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The correct Answer is:
A
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