Question

If humans can produce energy without oxygen, why does death follow for most humans who endure more than four minutes without oxygen?

Answer 1

Explanation:

Individual cells which experience anoxic conditions face greater challenges. ... However, other cells, like brain cells do not “remember” anaerobic respiration, and consequently cannot make any ATP without oxygen. This explains why death follows for most humans who endure more than four minutes without oxygen.

Answer 2

Answer:

As demonstrated by lactic acid fermentation, muscle cells still remember anaerobic respiration, using this fermentation to make ATP in low oxygen condition, regenerating NAD+ during this process...... this explains why death follow for most humans who endure more than four minutes without oxygen.