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Inside the heart

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Inside the heart

The heart is an organ, which is made up of muscle. The muscles allow the

heart to contract and pump the blood around the body.

Within the heart as described there are four chambers; two atria and two

ventricles. Between the atria and the ventricles there are valves, which

prevent blood moving in the wrong direction

  As the image illustrates deoxygenated enters the right atrium and

      oxygenated blood enters the left atrium.

 When the ventricle contract the blood enters either the pulmonary artery

      ( the only artery which has deoxygenated blood) or the aorta, a large 

      blood vessel, which takes the blood to the rest of the body.

 Between the atrium and ventricle are valves, which prevent backflow back

      into the atrium.

 Between the ventricles and the major blood vessels are valves which help

      to maintain the pressure and prevent backflow.

 The left ventricle in the heart has thicker walls compared to the right 

      ventricles because it has to pump blood much further.


Related Topics

Classification                                  The Heart

Blood Vessels                                  Blood