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When you hold your breath, which of the ...

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

A

rising CO2 concentration

B

falling CO2 concentration

C

rising CO2 and falling 0 2 concentration

D

falling 0 2 concentration

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TRUEMAN BIOLOGY-AIPMT-(2015)(conducted by CBSE)(solved paper-MCQs
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