Blood circulatory system (heart)
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Blood circulatory system (heart)

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

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

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Blood circulatory system (heart) Blood circulatory system (heart) Presentation Transcript

  • The Transport System In Humans Heart
  • HEART
  •  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.
  • 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.
  • Aortic arch Pulmonary artery Vena cava Left atrium Right atrium Left ventricleRight ventricle Median septum
  • 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.
  •  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
  • BLOOD FLOW
  •  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)
  • BLOOD VESSELS: There are three types of blood vessels namely:  artery  vein  capillary
  •  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
  • 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.
  • 5. ……………………….. carry deoxygenated blood towardsthe heart.