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This muscle never stops working… It works when you are asleep… It works when you eat… It really works when you exercise…. What is it????

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Presentation on theme: "This muscle never stops working… It works when you are asleep… It works when you eat… It really works when you exercise…. What is it????"— Presentation transcript:

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2 This muscle never stops working… It works when you are asleep… It works when you eat… It really works when you exercise…. What is it????

3 The HEART Located between the lungs in the mid thoracic region Apex points toward the left hip Surrounded by a membrane called the pericardium Composed of cardiac muscle tissue

4 The chambers: Left & Right Atria Left & Right Ventricles The valves: Atrioventricular valves = Tricuspid, Mitral, Semilunar valves = Pulmonary & Aortic The vessels: Pulmonary artery & vein Superior & inferior vena cava Aorta

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6 The Valves Allow blood to flow in only one direction The pulmonary semilunar valve is the doorway between the right ventricle and the pulmonary artery which carries “dirty” blood to the lungs The aortic semilunar valve is the doorway between the left ventricle and the aorta which carries “clean” blood to the body

7 The tricuspid valve separates the right atrium and right ventricle Composed of 3 flaps The mitral valve (sometimes called the bicuspid valve) separates the left atrium and left ventricle Composed of 2 flaps The Valves Allow blood to flow in only one direction Valves open as blood is pumped through Held in place by chordae tendineae (“heart strings”)

8 Aorta leaves left ventricle Pulmonary artery leaves right ventricle Superior vena cava enters right atrium Inferior vena cava enters right atrium L Pulmonary veins enters left atrium Rt Pulmonary veins enters left atrium

9 The Vessels Superior Vena Cava Inferior Vena Cava Carry deoxygenated blood from the upper and lower parts of the body into the heart Pulmonary Arteries Carry deoxygenated blood from the heart to the lungs Pulmonary Veins Carry oxygenated blood from the lungs to the heart Aorta Carries oxygenated blood from the heart out to the body

10 Functions to deliver oxygen and nutrients and to remove carbon dioxide and other waste products Cardiovascular System A DOUBLE PUMP system Pulmonary Circuit RA  RV  Pulmonary artery  capillary beds of the alveoli Systemic Circuit capillary beds of the alveoli  LA  LV  Aorta  Body

11 Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Blood flows through the right atrium into the right ventricle. The right ventricle pumps the blood to the lungs, where the blood releases waste gases and picks up oxygen. The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich blood to all parts of the body.

12 Lub If you listen to your heartbeat, it makes a lub dub sound. The lub is when blood is pushed out of the heart into the body and the dub is the reloading of the heart with more blood ready to push it out to the body Dub

13 Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting. The human heart can create enough pressure that it could squirt blood at a distance of thirty feet. Scientists have discovered that the longer the ring finger is in boys the less chance they have of having a heart attack. Heart Facts Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists. Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

14 COMPOSITION BOOK Cut out diagram of heart Label the major vessels Label the chambers Label the valves Color the areas of deoxygenated blood blue Color the areas of oxygenated blood red Answer the following questions in complete sentences on the page below your diagram 1.Why is the cardiovascular system referred to as a “double pump” system? 2.Where does the systemic circuit go? 3.What is the name of the circuit that is responsible for oxygenating the blood?


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