MCAT Biochemistry Question 176: Answer and Explanation
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Question: 176
11. In the absence of oxygen, which tissue will experience damage most rapidly?
- A. Skin
- B. Brain
- C. Red blood cells
- D. Liver
Correct Answer: B
Explanation:
The brain uses aerobic metabolism of glucose exclusively and therefore is very sensitive to oxygen levels. The extremely high oxygen requirement of the brain (20% of the body’s oxygen content) relative to its size (2% of total body weight) implies that brain is the most sensitive organ to oxygen deprivation.