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NEET UG BIOLOGY MCQ: BODY FLUIDS AND CIRCULATION

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In higher vertebrates, SA-node helps in

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Correct option: B

Initiation of heart beat

Option B (Initiation of heart beat) is correct because the SA-node is the heart's natural pacemaker, responsible for initiating the heartbeat.

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In ABO blood grouping, person with blood group

{O^ - }

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