World health organization

The journey of blood: from one life to another

Two tubes of anticoagulated blood showing cells and plasma.
WHO

Slide 2

Your body has about 5 litres of blood, accounting for 7% of your body weight, but this amount varies with age and gender. Blood is made up of several components - cells (45%) and a fluid part, the plasma (55%). The cells are of three types - red blood cells that transport oxygen in the body, white blood cells that fight infection and platelets that help the blood to clot at times of injury.

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