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Structure of the Heart
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Structure of the Heart

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Revision from AS OCR Biology (F211)

Revision from AS OCR Biology (F211)


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  • 1. Structure of the Heart
  • 2. DOUBLE CIRCULATORY SYSTEM Blood travels twice through the heart before it returns to the body
  • 3. The septum separates the right and left sides of the heart The superior vena cava transports blood from the head The inferior vena cava transports the blood from the rest of the body
  • 4. RIGHT The right atrium collects deoxygenated blood, and pumps it to the right ventricle The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs (only artery carrying deoxygenated)
  • 5. LEFT The pulmonary vein carries oxygenated blood from the lungs to the left atrium (only vein carrying oxygenated) The left ventricle pumps oxygenated blood to the body via the aorta
  • 6. The left ventricle has a thicker muscle, the right is smaller because it is only pumping to the lungs
  • 7. VALVES Atria-ventricular valves prevent backflow of blood into the atria when ventricles contract Right atrium=tricuspid valve Left atrium=bicuspid valve Semi-lunar valve prevent backflow of blood from the arteries into the ventricles