Which term describes the heart's ability to generate its own impulses?

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Study the AQA A Level PE Test for The Cardiovascular System. Prepare with flashcards and multiple choice questions, each with explanations. Get ready for exam success!

Multiple Choice

Which term describes the heart's ability to generate its own impulses?

Explanation:
The heart’s ability to generate its own impulses is described as myogenic. This means the impulse starts from the heart muscle itself, thanks to specialized pacemaker cells (notably in the sinoatrial node) that spontaneously depolarize and set the rhythm. This intrinsic automaticity drives the heartbeat even without nerve input, though the nervous system canSpeed up or slow down the rate as a modulator. The other terms imply that impulses come from nerves or the brain, which isn’t how the basic generation of the heartbeat works.

The heart’s ability to generate its own impulses is described as myogenic. This means the impulse starts from the heart muscle itself, thanks to specialized pacemaker cells (notably in the sinoatrial node) that spontaneously depolarize and set the rhythm. This intrinsic automaticity drives the heartbeat even without nerve input, though the nervous system canSpeed up or slow down the rate as a modulator. The other terms imply that impulses come from nerves or the brain, which isn’t how the basic generation of the heartbeat works.

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