Let's get straight to the heart of the matter--the heart's job is to move blood.
 

Day and night, the muscles of your heart contract and relax to pump blood throughout your body. When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream, you would follow the steps below one by one.
 
 

1. Oxygen-poor blood (shown in
blue) flows from the body into
the right atrium.
 

             2. Blood flows through the
                right atrium into the
                right ventricle.
 

3. The right ventricle pumps the
                       blood to the lungs, where the
                       blood releases waste gases and
                       picks up oxygen.
 

4.The newly oxygen-rich 5.Blood flows through the  6.The left ventricle
  blood (shown in red)    left atrium into the left  pumps the oxygen-rich
  returns to the heart    ventricle.                 bloodto all parts of 
  and picks up oxygen.                               the body.
 
 

Do right and left seem backward? That's because you're looking at an illustration of somebody else's heart. To think about how your own heart works, imagine wearing this illustration on your chest.
 
 

                  Did you know that your heart beats over 100,000 times a
              day?Let me tell you,more about this .
 
 

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