Multiple choice general knowledge science & technology

It takes about 1 min for a red blood cell to circle the whole body

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A red blood cell actually takes about 20-60 seconds to complete one full circulation through the body, not one minute. The heart pumps approximately 5 liters of blood per minute, and each red blood cell makes thousands of trips through the circulatory system in its 120-day lifespan. The one-minute estimate is close but not precise enough.

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