Often in movies and such when a person is struck in the heart they drop like a sack of potatoes. In real life if someone were to shoot you in the heart how long would you be able to function normally?
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To add to what others here have said, your brain operates the same way as our supply chains: Just -In-Time.
There are no fat stores, oxygen stores, etc. in the brain. There is no emergency backup or reserve. It is wholly reliant on the constant flow of blood to bring nutrients and oxygen, as well as carry away wastes. If that flow is disrupted for any reason, the brain very quickly shuts down. A sudden heart stoppage can render someone unconscious in seconds, and brain death within minutes.
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