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Blood circulatory system (heart)

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The ppt is used in lesson Form 5 Biology Chapter 1. Transport

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Blood circulatory system (heart)

  1. 1. The Transport System In Humans Heart
  2. 2. HEART
  3. 3.  Main function is to pump blood throughout the whole body The right side of the contains deoxygenated blood while the left side contains oxygenated blood.
  4. 4. Three types of valves Tricuspid valve found between the right atrium and ventricle. Bicuspid valve found between the left atrium and ventricle. Semi- lunar valve found between the right ventricle and the pulmonary arch as well as between the left ventricle and the aortic arch.
  5. 5. Aortic arch Pulmonary artery Vena cava Left atrium Right atrium Left ventricleRight ventricle Median septum
  6. 6. Blood Circulation Deoxygenated blood from different parts of the body is returned to the relaxed right atrium.  from the upper parts of the body via the superior vena cava.  From the other parts of the body via the inferior vena cava.
  7. 7.  When the right atrium contracts  tricuspid valve opens  deoxygenated blood enters the relaxed right ventricle When the right ventricle contracts  Tricuspid valve closes to prevent the backflow of blood into the atrium.  Semi-lunar valve opens  Blood enters the pulmonary arch which later divides into two pulmonary arteries carrying the deoxygenated blood to the lungs
  8. 8. BLOOD FLOW
  9. 9.  The pulmonary vein carries the oxygenated blood from the lungs to the relaxed left atrium When the left atrium contracts  bicuspid valve opens  blood enters the relaxed ventricle. The left ventricle now contracts  bicuspid valve closes to prevent the backflow of blood  semi-lunar valve opens  blood enters the aortic arch and is transported to all parts of the body (except the lungs)
  10. 10. BLOOD VESSELS: There are three types of blood vessels namely:  artery  vein  capillary
  11. 11.  Arteries : carry oxygenated blood away from the heart except pulmonary artery. Veins : carry deoxygenated blood towards the heart except pulmonary veins Capillary: connects artery and vein allows materials in blood to be exchanged with the surrounding tissue
  12. 12. Blood circulation Work sheet 2 Fill in the blanks with the suaitable answer. 1…………………. blood from different parts of the body is returned to the relaxed right atrium. 2. The pulmonary vein carries the ………….. blood from the lungs to the relaxed left atrium. 3. Three types of blood vessels are ………………, …………….. and ………………… 4. ………………….. carry oxygenated blood away from the heart.
  13. 13. 5. ……………………….. carry deoxygenated blood towardsthe heart.

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