Mala asked in Science & MathematicsBiology · 1 month ago

Where does all our blood come from?

I used to think we had a set amount of blood from birth but I know this is super not true. But I still don't know where our blood comes from?? Help

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  • 1 month ago

    If you're wondering where blood comes from originally it happens around the 13-15th day during gestation. 

    There are three layers to an embryo the ectoderm (the exoskeleton (e.g. skin)), mesoderm (organs), and endoderm (inner linning of organs). Blood develops within the mesoderm in what are termed blood islands.  

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  • Anonymous
    1 month ago

    blood comes from your organs

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  • D g
    Lv 7
    1 month ago

    ITS REPLACED  every 4 hours  from bone marrow if im not mistaken..  

    if the blood  is so contaminated that   it cant be replaced you will die this is what happens with  severe carbon monoxide poisoning

    • Smeghead
      Lv 7
      1 month agoReport

      Blood cells have lifespans in the range of months, not hours.

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  • 1 month ago

    my bet is the mineral iron. also, the bone marrow produces cells which travel through the porous heads of the large bones, these cells break-off and form red blood cells. 

    they have heme or  hemoglobin, 

     the red blood cells which carry oxygen.  

    the blood has many different cells and components.

    Source(s): "anatomy & physiology", text book. taber's medical cyclopedia.
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  • 1 month ago

    Blood is manufactured by the body's hematopoietic cells.

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  • 1 month ago

    Blood is mostly water that contains cells.  The water we drink, daily.  We get some from food too, of course.  The cells are made by conversion of food (like any cells).  The red blood cells are made in the marrow of the bones. Other stuff in the blood like hormones is made in other organs. Some of the stuff dissolved in the water comes from the stomach or intenstines (from what we eat) and other stuff is passed into the blood from the very many cells that are working for you as you live.  Gases enter and leave blood in the lungs, and the kidneys and liver do a lot of cleaning of dissolved stuff in the blood and help regulate the concentration of dissolved stuff in the blood (the water part of blood).

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  • 1 month ago

    Blood is generated by the marrow in our bones.

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  • 1 month ago

    Your blood is made in the spongy interior of the leg and arm bones, it exits through those tiny holes in it (look at a chicken leg bone next time, you'll see the holes).

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  • Anonymous
    1 month ago

    Your body makes it.  Google "blood formation"

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  • 1 month ago

    The red and white blood cells are continuously produced in the bone marrow.

    Most of the proteins in blood are produced by the liver, while antibodies in blood are produced by a specific type of white blood cells. Other proteins in blood are produced by other cells in the body.

    The liquid part of blood is ultimately water that you consume.

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