Multiple choice general knowledge

It takes __ seconds for a red blood cell to circle the whold body

  1. 60

  2. 40

  3. 20

  4. 50

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A red blood cell typically takes about 20 seconds to complete one full circulation through the human body. This impressive speed allows blood to deliver oxygen and nutrients efficiently to all tissues. The circulatory system is remarkably fast, pumping blood through the entire body in just one-fifth of a minute.