Heart

• The human heart is a remarkable organ.
• Its function is to move the living stream of blood through all parts of the body, never stopping even for a moment in its endless activity.
• Although the heart is one single organ, it actually consists of two chambers, receives blood from all parts of the body and propels it to the lungs.
• There the blood drops its load of carbon dioxide and receives a fresh supply of oxygen, then passes to the left side of the heart (with its two chambers also) and from there it is pumped to all parts of the body.
  
  Each side of the heart operates independently of the other, but they act together in keeping the blood circulation normally.