HEART

• The heart is a muscular organ that pumps blood all over the body
• The heart is a fist-sized organ that is located between the lungs and behind the breastbone
• Pericardium


  A protective membrane surrounding the heart
• Heart


  • Divided into two sides
  • Separated by a wall of muscle called the septum
  • Has four chambers
  • Contains valves to prevent backflow of blood
• Chambers of the heart

  • Left atrium
  • Right atrium
  • Left ventricle
  • Right ventricle
• Atria


  The upper thin-walled chambers that are the collecting chambers of the heart
• Ventricles


  The lower thick-walled chambers that are the pumping chambers of the heart
• Valves are present in the four chambers to prevent the backflow of blood