Last Updated date : 2020-05-22


Blood is the red fluid that circulates in our blood vessels, i.e.veins and arteries. The main function of blood is to act as the body’s transport system, but it also has a major role in the body’s defence against infection. There is no substitute for blood. It cannot be made or manufactured.

The major components of blood are:

  • Red blood cells, which carry oxygen throughout the body.
  • White blood cells, which fight infections.
  • Platelets, which are cells that help you stop bleeding if you get a cut.
  • Plasma, a yellowish liquid that carries nutrients, hormones, and proteins throughout the body.

Bone marrow, which is inside your bones, makes the red blood cells, the white blood cells, and the platelets. Plasma is mostly water, which is absorbed from the intestines from what you drink and eat, with the liver supplying important proteins.

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