Hello friends ! This is techo of world. In this post  i am going to saying about blood .What is blood ? Why it is red ? 

 So,  friends i start this series.
Blood facts

 Blood types
1.red blood cells ( erethrocytes)
It has iron.
If it is low then human are attack by anemia.
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.Red blood cells carry oxygen from your lungs to your tissues. They also bring carbon dioxide back to your lungs.
.Red blood cells make up almost half of your blood. The lifespan of a red blood cell is around 120 days.
2.white blood cells ( leukocytes)
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.It fight with germs,  disease.
.White blood cells fight infection and are an important part of your immune system. They make up a very small part of your total blood (less than 1%).
There are 3 types of white blood cells: granulocytes, monocytes, and lymphocytes. Each type has an important role.
  • There are 3 types of granulocytes:
    • Neutrophils help fight bacterial and fungal infections.
    • Basophils are part of your body’s immune response. Their exact function isn’t well known.
    • Eosinophils help fight infections caused by parasites.
  • Monocytes break down and remove foreign organisms and dying cells from your body.
  • Lymphocytes make up your immune system.
If it is high then human are attack by  blood cancer.
White blood cells have a wide range of lifespans, from hours to years.

3.Platelets (thrombocytes)

Platelets are small parts of cells. Their main function is to control bleeding. They make up a very small part of your blood (less than 1%). The lifespan of platelets is about 9 to 12 days.
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.It help to freeze blood when skin are cutted by something. It help to stop bileding of blood.

Why blood is red ?
It is simple. Because of presense of iron in RBC.

 .Blood is helping to transfer unnecessary thing from productive organs.

 .Blood is everywhere in human body any organs,any part of body.