Eli5 How a heart beats continuously in regards to the nervs after a transplant?

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Eli5 How a heart beats continuously in regards to the nervs after a transplant?

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Answer: the heart has its own electrical system and pacemaker. Most of the time when the heart needs to speed up the body sends a message using adrenaline or noradrenaline (chemicals in the blood) so missing nerve connections don’t matter

The heart has its own pacemaker so it doesn’t need a nerve connection to beat. It will beat on its own.

A lot of the control is by nerves, and this is lost after a transplant. The heart rate doesn’t suddenly increase in the event of a shock, and it doesn’t drop very low when calm. It just stays in the range of about 90-110 most of the time.

Nerves are not the only thing which control heart rate. The heart can sense demand, so it will beat harder and faster during exercise, just not as fast or as hard as if it had nerves urging it on as well.

Similarly, adrenaline and similar substances circulating in the blood will make the heart beat faster and harder, so the heart rate will go up when stressed or shocked. However, the response of circulating adrenaline is slower than the instant nerve signals.