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Circulatory System What does the transport system do? Carries O2, CO2, nutrients, hormones, wastes, cells of the immune system Regulates body temp. Circulatory System Also known as the Cardiovascular System. It carries needed substances to cells and carries waste products away from cells. The Heart – pumps blood through body Inside the heart Blood Vessels Arteries – carry blood away from heart – thick round muscular walls- no valves Blood Vessels Veins – carry blood to the heart – has valves to prevent backflow – thin flattened shape Blood Vessels Capillaries – one cell thick What’s in blood? Plasma –carries nutrients, wastes, and water Red Blood Cells – carry oxygen and carbon dioxide White Blood Cells – fight infections Platelets – help with blood clotting How do RBC’s carry Oxygen? Hemoglobin – a protein found on RBC attaches itself to both oxygen and carbon dioxide Pulmonary Circulation Blood flows from the heart to the lungs where it picks up O2 and loses CO2 and water vapor Pulmonary Circulation Artery Transports blood away from the heart. Very Muscular Very Elastic Thick Muscle Walls Aorta Largest Artery Carries oxygenated blood Veins Transports blood toward the Heart Thinner walls Valves Prevents backflow Carries deoxygenated blood Capillaries One celled microscopic blood vessels Connect Arteries Veins Heart Muscular organ pumps blood throughout the body Valve flap of tissue that prevents blood from flowing backwards. Atrium2 upper chambers, receive blood that comes into the heart Ventricle 2 lower chambers , pumps blood out of heart Pericardium Covers and protects the heart What are the different types of molecules that are transported throughout the circulatory system? Molecules that travel through Circ. Nutrients from digested food O2 from the lungs Metabolic wastes (CO2) Molecules that travel through Circ. Hormoneshelp coordinate activities in body Heatblood vessels constrict or relax Regulation of Heartbeat Pacemaker located in the right atrium, sends out signals that make the heart muscle contract. It receives messages about how much oxygen is present A “Real Pacemaker” Medical Pacemaker High Blood Pressure Disease caused when blood pressure in the arteries is increased by stress, diet, heredity, smoking, & aging. Stroke When an area of the brain dies because the area didn’t receive enough O2 Heart Attack Symptoms sharp, crushing, squeezing pain in the chest, cold sweats, nausea, limb numbness An area of the heart muscle dies and stops working Coronary Thrombosis Type of heart attack caused by blockage in one of the arteries that carry blood to the heart. Blockage of blood flow to the heart, damaged from lack of oxygen Leukemia Form of cancer in which bone marrow makes too many white blood cells Anemia When the blood doesn’t have enough hemoglobin or RBC causing body cells to not receive enough O2 Arteriosclerosis Fatty plaque builds up on wall of artery blocking normal blood flow Amazing Heart Facts Your heart is about the same size as your fist. An average adult body contains about f five quarts of blood. By the time you turn 70, your heart will have beat some twoand-a-half billion times (figuring on an average of 70 beats per minute.) The risk of heart attack is higher on Monday than any other day of the week. Each square inch of human skin consists of twenty feet of blood vessels. All the blood vessels in the body joined end to end would stretch 62,000 miles or two and a half times around the earth. 1.The heart circulates the body's blood supply about 1,000 times each day. 2. The heart pumps the equivalent of 5,000 to 6,000 quarts of blood each day.