What percent of the average brain is made of water?

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Multiple Choice

What percent of the average brain is made of water?

Explanation:
Brain tissue is composed largely of water, roughly three quarters of its weight. So the average brain is about 75 percent water, making that option the best choice. The other numbers are farther from the typical measurement: 60% underestimates the water content, 70% is a bit low for the average brain, and 80% overestimates it. This high water content supports the brain’s metabolic and signaling processes, and helps explain why dehydration can quickly impact cognitive functioning, even in children.

Brain tissue is composed largely of water, roughly three quarters of its weight. So the average brain is about 75 percent water, making that option the best choice. The other numbers are farther from the typical measurement: 60% underestimates the water content, 70% is a bit low for the average brain, and 80% overestimates it. This high water content supports the brain’s metabolic and signaling processes, and helps explain why dehydration can quickly impact cognitive functioning, even in children.

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