Without oxygen, brain damage begins within about how many minutes?

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Multiple Choice

Without oxygen, brain damage begins within about how many minutes?

Explanation:
Brain tissue is highly sensitive to oxygen loss. When oxygen stops, neurons cannot produce enough energy, ion pumps fail, and there’s a cascade that leads to cell swelling and death. Because neurons rely on a constant oxygen supply and have little energy reserve, damage begins after only a few minutes of hypoxia. The commonly cited window before brain injury starts is about four minutes without oxygen. If oxygen delivery isn’t restored promptly, the risk of irreversible injury rises quickly, and by around six minutes the damage is more likely to be permanent, with eight minutes implying severe injury. So, the best answer is about four minutes.

Brain tissue is highly sensitive to oxygen loss. When oxygen stops, neurons cannot produce enough energy, ion pumps fail, and there’s a cascade that leads to cell swelling and death. Because neurons rely on a constant oxygen supply and have little energy reserve, damage begins after only a few minutes of hypoxia. The commonly cited window before brain injury starts is about four minutes without oxygen. If oxygen delivery isn’t restored promptly, the risk of irreversible injury rises quickly, and by around six minutes the damage is more likely to be permanent, with eight minutes implying severe injury. So, the best answer is about four minutes.

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