1. heart, blood vessels, and blood- transports materials such as oxygen, nutrients and carbon dioxide to and from our body cell.
2. Mouth, esophagus, stomach ( small and large intestine) and accessory structures (salivary glands,liver, gallbladder, pancreas) - breaks down food into substances or body can use and absorbs nutrients into the blood.
3. Gland : ovaries, testes,and pancreas- produces hormones that transfer information throughout our body.