Why do you colapse immediatly after your heart has stopped beating because of a heart attack and not a few minutes later after your body has run out of oxygen?
In: 55
As soon as the heart stops beating (well between zero and a couple of seconds), your blood pressure will drop significantly. Your brain needs all the oxygen it can, and being at the top of your body, it is the hardest place to reach if blood pressure is low. So your body has a built-in defence mechanism, when your blood pressure drops too much, it makes you lose consciousness so you fall on the floor and put the head level to the heart to maximize oxygen that can reach the brain with low pressure. It is just that in that case you will never regain consciousness because blood pressure and oxygen level will increase.
Tldr: heart stops beating, blood pressure drops immediately, brains goes “oh shit, not enough pressure to reach, must force this body to drop down on the floor”, you lose consciousness
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