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Chapter 2 The circulatory system’s job is to pump blood to all parts of the body. It is made up of the heart, blood vessels, and blood It also consists of arteries, veins and capillaries Arteries carry blood filled with oxygen to all parts of the body. Veins carry blood filled with carbon dioxide to the lungs. Capillaries are the tiny vessels where the exchange of gases takes place. Your respiratory system is responsible for making sure your cells have the oxygen that they need. Your skeletal system consists of bones, cartilage , and ligaments. It is responsible for the structure of your body, and protecting internal organs. Your muscular system enables your body to move. Everything that moves on you is attached to a muscle. Your muscles work in pairs to move you. Tendons hold the muscles to bones. You have two kinds of muscles, voluntary and involuntary. Your nervous system enables you to sense your environment and react to it. There are two parts: Your central nervous system consists of your brain and spinal cord. Your peripheral nervous system connects your brain to your sensory organs.