InterviewSolution
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Are SN and AV nodes of heart, controlling heartbeat; completely independent or are controlled by heart or brain. |
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Answer» The UPPER heart CHAMBERS (ATRIA) contract. The AV node sends an impulse into the ventricles. The LOWER heart chambers (ventricles) contract or PUMP. The SA node sends another signal to the atria to contract, which starts the cycle over again. |
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