substance which leaks from blood capillaries which helps fight infection
It contains proteins, fats, salt, and other substances. Some of the proteins are important in blood clotting. The blood cells are red cells, white cells, and platelets. Red blood cells carry oxygen to all parts of the body.White blood cells help fight infection. Platelets are tiny cells that have a big job in stopping bleeding.t contains proteins, fats, salt, and other substances. Some of the proteins are important in blood clotting. The blood cells are red cells, white cells, and platelets. Red blood cells carry oxygen to all parts of the body.