NEET 2015 Biology Cancelled Paper

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Question : 65 of 90

Marks: +1, -0

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

[NEET 2015 C]

rising CO‌2 concentration
falling CO‌2 concentration
rising CO‌2 and falling O‌2concentration
falling O‌2concentration

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