![]() Blood is prevented from clotting in the blood vessels by their smoothness, and the finely tuned balance of clotting factors. Platelets, smaller cells that help blood to clotīlood is conducted through blood vessels (arteries and veins).White blood cells, which fight infections.Red blood cells, which carry oxygen to the tissues. ![]() Blood plasma also contains glucose and other dissolved nutrients.Ībout half of blood volume is composed of blood cells: ![]() Plasma contains proteins that help blood to clot, transport substances through the blood, and perform other functions. The average person has about 5 liters (more than a gallon) of blood.Ī liquid called plasma makes up about half of the content of blood. Blood is mostly liquid, with numerous cells and proteins suspended in it, making blood "thicker" than pure water. ![]() Blood is a constantly circulating fluid providing the body with nutrition, oxygen, and waste removal. ![]()
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