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NEET UG BIOLOGY MCQ: BREATHING AND EXCHANGE OF GASES

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If the level of carboxyhaemoglobin in blood reaches upto……, the functioning of central nervous system is severely affected which results in death.

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Correct option: A

1 to 2%

Option A (1 to 2%) is correct because carboxyhemoglobin levels of 1-2% can severely affect the central nervous system, leading to death.

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