Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic waste products away … Blood is a specialized fluid that constantly flows throughout your body. It’s made of plasma, red blood cells, white blood cells and platelets.

The body contains about 5 to 6 quarts (about 5 liters) of blood. Blood performs various essential functions as it circulates through the body: Once blood is pumped out of the heart, it takes 20 to 30 … It has four main components: Plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole bloodâ€a mixture of about 55% … Donate blood on the big red bus or at a blood donation center near you.

Plasma, red blood cells, white blood cells, and platelets. The blood that runs through the veins, arteries, and capillaries is known as whole bloodâ€a mixture of about 55% … Donate blood on the big red bus or at a blood donation center near you. By giving blood, you give the gift of life. Detailed information on blood, including components of blood, functions of blood cells and common blood tests.

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