Adult human brain is about_________% of the total body weight.
Correct answer: A. 2%
- A. 2%
- B. 3%
- C. 7%
- D. 8%
Explanation
The adult human brain has a mass of roughly 1.3 to 1.4 kg, while average body mass is about 65 to 70 kg, giving approximately 1.3/65 x 100% = 2%. Thus, the brain is about 2% of body weight despite using a much larger share of the body's energy. Students may choose 3% because the brain is relatively large, but they are overestimating its percentage of total body mass.
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