• Question: how much blood dose the average person produce a day

    Asked by CiaraTheWaterBear to Samuel, Pankaj, Lucy, Kate, Jordan, Emma on 18 Jun 2018.
    • Photo: Samuel Vennin

      Samuel Vennin answered on 18 Jun 2018:


      It again depends on your age and overall fitness, but there is on average about 6L of blood in your body and common agreement is that the most important part of your blood, the red blood cells, lasts about a third of a year (so roughly 120 days). This means that your 6L of blood gets entirely replaced in 120 days. 6L/120 days = 0.05 L/day.
      The answer is hence that every day, you produce about 50 mL of blood.

    • Photo: Emma Wellham

      Emma Wellham answered on 19 Jun 2018:


      The bone marrow (where blood is made) produces about 2 million red blood cells every second!

    • Photo: Jordan Moir

      Jordan Moir answered on 19 Jun 2018:


      On from this if you donate blood it takes a person 4 to 6 weeks to completely replace all the red cells and plasma lost during donation this is why at least 8 weeks are required between donating blood.

    • Photo: Lucy Green

      Lucy Green answered on 19 Jun 2018:


      The fetus / unborn baby of about 8lb at birth has about 441 L blood!
      The making of blood changes as the baby gets older in pregnancy … At first the red blood cells are made by cells in the yolk sac, then in the liver and finally in the bone marrow .
      The red cells live a little shorter in the full term infant 80-90 days!

Comments