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In reply to the discussion: Family of dead, pregnant woman is suing Texas for using her body as an incubator. [View all]kestrel91316
(51,666 posts)The heart beats completely independently of the brain. When I euthanize my patients, their heart doesn't stop beating until about 5 minutes after the last breath, when the blood no longer contains sufficient oxygen to keep it going.
The electrical activity of the heart that causes the muscle to beat comes from within the heart itself, in a specific location. If that malfunctions, some people wind up needing a pacemaker. Nothing to do with the brain.
The vagus nerve does have involvement in the heart RATE, and every time you breathe the vagus is compressed, which causes the heart rate to briefly rise, and when you exhale the nerve is not compressed so it does its thing to slow the heart rate down again. But the brain does not cause the heart to beat.
Yes, I do know what I am talking about, and I certainly know more about this than crappy journalists and crappy hospital spokespersons.