The brain neurons may get irreversibly damaged if exposed to significant hypoxia for:: (A) 8 minutes., (B) 20 min, (C) 5 sec., (D) 15 sec
Answer is A. Ans. A. 8 minutes.The cerebral cortex can tolerate the acute hypoxia due to complete circulatory arrest for 5-10 min at 28deg C, 20 min at 20deg and 50 min at 15degC