Question

(3.2.b) breathing emergencies: quiz
brain cells deprived of oxygen begin to die in-
1 to 2 minutes.
1 to 3 minutes.
2 to 4 minutes.
4 to 6 minutes.

Explanation:

Brain cells are highly sensitive to oxygen - deprivation. Without oxygen, they start to die within 4 to 6 minutes due to lack of energy production through aerobic respiration.

Answer:

4 to 6 minutes.