Normally, the rate of the heart beat in a human is determined by _________________?
Correct answer: B. The sinoatrial node
- A. The bundle of His
- B. The sinoatrial node
- C. All cardiac muscle
- D. The cervical ganglion
Explanation
The sinoatrial node is the normal pacemaker because it has the highest intrinsic rate of spontaneous depolarisation. Its impulses normally set the rate for the rest of the heart.
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