Multiple choice

How long does it take for a red blood cell to make a full circuit through the human body?

  1. 60 seconds

  2. 240 seconds

  3. 3,600 seconds

  4. 86,000 seconds

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

On average, it takes a single red blood cell about 60 seconds (one minute) to complete a full cycle of circulation through the entire human body. This includes traveling from the heart to the lungs, back to the heart, out to the rest of the body, and back to the heart again.