14 The Heart

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14 The Heart

  1. 1. My heart is a muscle and it pumps blood Like a big old black steam train My veins are the tracks And the city is my brain - The Cruel Sea (1993)
  2. 2. The Heart
  3. 3. Animation
  4. 4. Right atrium Right ventricle Left atrium Left ventricle 1 2 3 4
  5. 5. The Chambers <ul><li>Pump blood to the required destinations </li></ul><ul><li>Right atrium – pumps blood to right ventricle </li></ul><ul><li>Right ventricle – pumps blood to lungs via the pulmonary artery </li></ul><ul><li>Left atrium – pumps blood to left ventricle </li></ul><ul><li>Left ventricle – pumps blood to the body via the aorta </li></ul>
  6. 6. Superior vena cava Inferior vena cava Left pulmonary artery Left pulmonary vein Right pulmonary vein Aorta 1 2 3 4 5 6 7 Right pulmonary artery
  7. 7. The Blood Vessels <ul><li>Arteries carry blood from the heart and veins carry blood to the heart </li></ul><ul><li>Superior and inferior vena cava – carry blood from the body to the right atrium </li></ul><ul><li>Pulmonary arteries – carry blood from the right ventricle to the lungs </li></ul><ul><li>Pulmonary veins – carry blood from the lungs to the left atrium </li></ul><ul><li>Aorta – carries blood from the left ventricle to the body </li></ul>
  8. 8. Tricuspid valve Pulmonary valve Mitral valve Aortic valve 1 2 3 4
  9. 9. The Valves <ul><li>Valves ensure that blood flows in one direction only </li></ul><ul><li>Tricuspid valve – from right atrium to right ventricle </li></ul><ul><li>Pulmonary valve – from right ventricle to pulmonary artery </li></ul><ul><li>Mitral valve – from left atrium to left ventricle </li></ul><ul><li>Aortic valve – from left ventricle to aorta </li></ul>
  10. 10. Comparative Circulation <ul><li>The circulatory system that we share with a number of other animals is called a closed circulatory system, in that the blood never leaves the blood vessels. </li></ul><ul><li>The blood carries the materials to cells and they diffuse in and out, but the blood does not leave. </li></ul><ul><li>In an open system, blood leaving the heart bathes the organs before returning to the heart. </li></ul>
  11. 11. Closed circulatory systems <ul><li>A) Fish have one atrium and one ventricle and blood is oxygenated en-route to the body. </li></ul><ul><li>B) Reptiles and amphibian have two atria and one ventricle in which oxygenated and deoxygenated blood mix. </li></ul><ul><li>C) Mammals and birds have the 4 chambered system with which we are familiar. </li></ul>A B C
  12. 12. Open circulatory systems <ul><li>The aorta takes blood from the insect heart distributes blood around the body so that it can surround all the tissues and organs to distribute nutrients before returning to the heart. </li></ul><ul><li>The blood is translucent as it contains no haemoglobin (no oxygen is carried by the blood). </li></ul>
  13. 16. right atrium lungs pulmonary arteries mitral valve right ventricle tricuspid valve pulmonary veins left atrium aortic valve vena cava pulmonary valve left ventricle aorta
  14. 17. BODY The Mammalian Heart

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