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blood vessels made up of arteries, capillaries and the veins, these make up the closed transport system that carries the blood throughout the body; it is how enters and leaves the heart, as pathways through which the blood carries food and oxygen to all parts of the body arteries carries blood loaded with oxygen away from the heart; these are thick-walled blood vessels carrying blood rich in food and oxygen -- these expands and contracts and does not have valves veins carries blood that contains carbon dioxide and wastes back to the heart capillaries through these, oxygen and nutrients leave the blood and enter the body's cells (supplies food and oxygen to the cells); the smallest blood vessels in the body which connect an artery to a vein. their walls are only one-cell thick where only one blood cell can pass through at a time blood pressure produced by pumping of blood; it is the push of blood against the walls of the blood vessels vena cava largest vein in the body. valves part of the veins which act like doors which keep the blood from flowing backwards, which allows blood to flow only in one direction in the veins. blood called the red river of life, it is the red fluid that continually flows through the blood vessels circulating through the heart, the arteries, the capillaries, and the veins, carrying food and oxygen to every part of the body 5 liters is how much blood an average adult has in his/her body red blood cells oxygen in the body is carried by these; the first solid part of the blood; these cells live about 120 days after they enter the blood stream hemoglobin found in the red blood cells, it is a protein that attracts and holds oxygen molecules (contains iron and makes blood red) bone marrow where the red blood cells are produced; continuously makes new blood cells to replace dead cells. it is also where white blood cells are produced white blood cells the second solid part of the blood, this is a whole army of cells in the blood that protects the body against diseases; these fight harmful germs that may enter the body through a cut on the skin or through food, water or air that is not clean. platelets the third solid part of the blood; smaller than red blood cells and are not whole cells but are just part of the cells that control bleeding as it helps blood to clot when you have a cut or wound. Without these, a person could bleed to death from a cut. bleeding happens when you accidentally cut your skin and the blood flows out plasma yellowish liquid part of the blood which makes it possible for the red and white blood cells get around the body. it is mostly made up of water, aside from many different kinds of matter