Multiple choice

What percentage of our blood is water?

  1. about 45%

  2. about 50%

  3. about 75%

  4. about 80%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood plasma, which makes up about 55% of blood volume, is roughly 90-92% water. When considering whole blood (including red blood cells, white blood cells, and platelets), water constitutes about 80% of the total composition.

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