Structure and function of the heart

  • Heart is located in the thoracic cavity between the lungs and behind the sternum, itis enclosed in a fiborous bag made from inelastic connective tissue called the pericardium.
  • The hearet is a muscular double pump divided into two halves, each of which contain two chambers. 
  • The wall of the heart is made from mainly myocardium, that consists of cardiac muscle. 
  • This contracts to make your heart beat. 
  • Coronary arteries seen lie on the surface of the heart. 
  • They oxygenated blood to the heart muscle. 
  • The heart is divided into four chambers. 
  • 2 upper chambers are called the atria and they have thin walls and they sit above the two lower chambers called ventricles. 
  • Ventricles are thicker walled chambers. 
  • Deoxygenated blood flows into the right atrium from the vena cava; at the same time the left atriun receives oxygentated blood from the lungs via the pulmonary vein. 
  • From here the blood flows into…


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