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

Under resting conditions, it takes approximately 60 seconds for a red blood cell to complete a full circuit through the entire circulatory system.