"it doesn't, as soon as your head has parted from your torso it has lack of blood and you die a quick and painful death"
The brain is chemically alive for approximately 13 seconds...
The brain can live about 2 minutes after the heart stops beating. When the oxygen is used up, the brain is dead. Technically, the person isn't dead until the brain is dead.
Human brain cells live between 30 and 50 hours. Got this from www.sciencesource.ca. But don't worry, your brain cells produce more cells before they die This is totally wrong. COMPLETELY wrong....