Multiple choice general knowledge

It takes about -- seconds for a red blood cell to circle the whole body.

  1. 5

  2. 10

  3. 15

  4. 20
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Red blood cells (erythrocytes) complete one full circulation through the human body in approximately 20 seconds under normal resting conditions. This remarkable efficiency allows oxygen to be delivered rapidly to tissues throughout the body. The heart pumps about 5 liters of blood per minute, making this quick circulation essential for sustaining life.

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