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Circulatory System Also known as the cardiovascular system What is the function of the circulatory system? • Carries needed substances to cells (oxygen, nutrients). • Carries waste products away from cells. • Contains cells that fight disease What is the function of the heart? • It pushes blood through the blood vessels every time it beats. • It is made up of cardiac tissue. What is the structure of the heart? • Atrium (atria): The 2 upper chambers of the heart. They receive blood that comes into the heart. • Ventricle (s): The 2 lower chambers of the heart. They pump blood out of the heart. What is the function of the atria? Right atrium: receives blood from the body. The blood is high in carbon dioxide and low in oxygen. Left atrium: receives blood from the lungs. The blood is high in oxygen. What is the function of the ventricles? • Right ventricle: pumps blood to the lungs. The blood is high in carbon dioxide. • Left ventricle: pumps blood to the body. The blood is high in oxygen. Illustrated Heart Describe the path blood takes as it flows through your body? • Blood from the body comes into the right atrium. • From here the blood flows into the right ventricle where it is pumped to the lungs. • Blood comes back from the lungs into the left atrium. • The blood flows to the left ventricle where it is pumped to the rest of the body. http://trc.ucdavis.edu/biosci10v/bis10v/media/ch22/blood_circulation.html Cardiovascular System http://trc.ucda vis.edu/biosci 10v/bis10v/me dia/ch22/majo r_vessels.html What are the blood vessels? Describe the function of each. • Arteries: carry blood away from the heart. • Veins: carry blood back to the heart. • Capillaries: the smallest blood vessels. Exchanges substances between the blood and body cells What is the pulse? What is blood pressure? • Pulse: determines how fast your heart is beating. It is caused by the contraction of the ventricles. • Blood pressure: caused by the force with which the ventricles contract. The top number is a measure of pressure when the left ventricle contracts. The lower number measures the pressure when the ventricle relaxes between heartbeats. http://pennhealth.com/health_info/bloodless/000201.html What are the components found in blood? • Red blood cells: take up oxygen in the lungs and delivers oxygen to body cells. • White blood cells: fight disease • Plasma: the liquid part of blood • Platelets: helps blood clot when a blood vessel is cut. What other body systems work with the circulatory system? • Respiratory system: The blood picks up oxygen from the lungs. • Nervous system: Keeps the heart beating automatically. It is an involuntary muscle. • Digestive system: Picks up needed nutrients from foods and carries them to body cells. Amazing Heart Facts • Your heart is about the same size as your fist. • An average adult body contains about five quarts of blood. • 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. • The heart circulates the body's blood supply about 1,000 times each day. • The heart pumps the equivalent of 5,000 to 6,000 quarts of blood each day.