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12 Minutes.
If the brain was without oxygen for 4 to 6 minutes can caused brain dead. Early CPR is needed to prevent brain damage or hypoxia.
Your Brain will function for at least 6 to 7 minutes after your heart has stopped.
3-4 minutes.
General medical consensus states that the human brain can go without oxygenated blood for 3 to 5 minutes without suffering major brain damage. After this time has elapsed, the cells in the brain will begin to die from lack of oxygen, resulting in brain damage.
Damage to the brain from what? Drowning? lack of oxygen? Or what happened to you when you were answering this question?
You are for sure dead. The average human can go 3 minutes without air, anything after that can cause permanent brain damage or death.
There are a lot of variables, but 4 minutes is the usual guideline. Blood carries oxygen, and blood is pumped by the heart. Brain damage occurs after 4 minutes without fresh oxygen to the brain.
4-6 minutes and brain damage sets in
It is roughly around 3 minutes and it depends on the person (i.e. baby, adult...etc.). Brain damage is irreversible no matter how long you are without oxygen. Once brain damage begins you can never regain those cells that have died.
Brain cells can only survive for 3 minutes without a supply of oxygen.
Actually, no human being can go without oxygen for 4 minutes and be expected to live