What is blood? blood is made up of liquid (plasma and various different types of cells. an average-sized man has about 5-6 liters of blood in his body; a woman has slightly less. where is blood found? blood is found in blood vessels. blood vessels (arteries, arterioles, capillaries, venues and veins take blood to and from every part of your body. blood is pumped through blood vessels by your heart. what is normal blood made up of? blood cells these can be seen under a microscope and make up about 40% of the blood's volume. blood cells are divided into three main types: ' red cells (erythrocytes. these make blood a red color. one drop of blood contains about five million red cells. a constant new supply of red blood cells is needed to replace old cells that break down. millions of red blood cells are made each day. red cells contain a chemical called hemoglobin. this binds to oxygen and takes oxygen from the lungs to all parts of the body. what is normal blood made up of? blood cells these can be seen under a microscope and make up about 40% of the blood's volume. blood cells are divided into three main types: ?