The heart

• Heart


  An organ that pumps blood around the body in a double circulatory system
• Double circulatory system


  1. Right side sends deoxygenated blood to the lungs

  2. Left side sends blood all around the body (left thicker walls)
• Heart structure


  • Pulmonary artery
  • Vena cava
  • Right atrium
  • Aorta
  • Pulmonary vein
  • Left atrium
  • Left ventricle
  • Right ventricle
• Coronary arteries


  Supply oxygen rich blood to the heart muscle
• Arteries


  Carry blood away from the heart
• Veins


  Carry blood towards the heart
• Ventricles


  Bottom chambers of the heart
• Atria


  Top chambers of the heart
• Valves


  Stop the backflow of blood
• Natural pacemaker


  In the right atrium
• Artificial pacemakers


  Used to correct irregularities in the heart rate