Discussion
If heart beat rate increases
Answer: A
If the heart rate increases, the pulse rate increases.
The pulse is the wave of expansion that passes along an artery each time the heart contracts and pushes blood into it. Each heartbeat therefore produces one pulse, so the pulse rate felt at the wrist equals the heart rate and rises and falls with it.
For the pulse rate to fall, stop or stay constant while the heart beats faster would break this one-to-one link, so the other three options are wrong.
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