Circulatory System Function: transports nutrients and wastes through the body.maintains body temperature. Structure: • Blood which contains: red blood cells, white blood cells, platelets and plasma. Blood vessels • Veins - Returns blood to the heart • Arteries - Takes blood to the body. • Capillaries - Smallest, between arteries & veins. • Heart, the muscle that pumps the blood through the vessels. Human Circulation Key 1. superior vena cava 2. inferior vena cava 3. right atrium 4. tricuspid valve 5. right ventricle 6. semi lunar valve 7. pulmonary artery 8. pulmonary vein 9. left atrium 10. bicuspid valve 11. left ventricle 12. semi lunar valve (aortic) 13. aorta Valves: Flaps of connective tissue. Found in the heart and in the veins. Prevents blood from flowing backwards. Systemic Circulation: Circulation through the body. • Pulmonary Circulation: Circulation through the lungs. • • • • Structure of the heart and circulation of the blood. • Pulmonary Circulation: circulation from the body to the lungs. • Right atrium: receives blue blood from body through the vena cava and sends it through the tricuspid valve. • Tricuspid valve: leads to right ventricle. • Right ventricle: pumps blood through semi lunar valves into the pulmonary arteries. • Pulmonary arteries: transports blood to the lungs to get oxygen. • Lungs: carbon dioxide leaves blood and oxygen enters blood through the capillaries and alveoli. Systemic Circulation: circulation from the heart to the body. • Pulmonary veins: returns oxygenated blood to the heart. • Left atrium: receives red blood from pulmonary arteries and sends it through the bicuspid valve. • Bicuspid valve: leads to left ventricle. • Left ventricle: pumps blood through semi lunar valves into the aorta. • Aorta: largest artery that pumps blood out to the body's capillaries. • Capillaries: attached to body parts that exchange gases and nutrients/wastes with the body. Immune System: contains lymph fluid that travels through vessels and nodes to filter and remove harmful materials from your body. Some WBC's are made in the lymph nodes.