2.63 describe the structure of the heart and how it functions

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PC: BBC BITESIZE

  1. Vena cava  pumps deoxygenated blood (Blood that has travelled around the body) into the right atrium
  2. Right atrium receives deoxygenated blood which goes into the right ventricle into the tricuspid valve. (Use of a valve: so that blood doesn’t flow backwards, only forwards)
  3.  Right ventricle pumps deoxygenated blood into the lungs so that it can be oxygenated, helped by heart pumps (contractions)
  4. Pulmonary vein pumps oxygenated blood from lungs into left atrium 
  5. Left atrium pumps deoxygenated blood into the left ventricle by the bicuspid valve
  6. Left ventricle pumps oxygenated blood around the body helped by a series of contractions
  • Left ventricle has a thicker muscle wall than the right ventricle.
  • Left ventricle pumps oxygenated blood around the body. Left ventricle, oxygenated blood – higher pressure than right
  • Right ventricle only pumps deoxygenated blood to the lungs. Right ventricle, deoxygenated blood – lower pressure than the left
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