The Circulatory Sysem

What is it?

The circulatory system is a network of veins and arteries that carry the blood around the body. The heart pumps blood towards the lungs where carbon dioxide is exchanged for oxygen. The blood is then pumped back to the heart and round the body. It then gives the body nutrients, water and oxygen while removing carbon dioxide. The blood has no oxygen and is pumped back to the heart so the cycle can begin again.

The Heart

About the size of a fist, the heart is one of the most important organs in the circulatory system. The heart is made up of four chambers:

  • left atrium
  • right atrium
  • left ventricle
  • right ventricle
  • Valves open to let the blood in and close so the blood can't run backwards, the blood is then pumped to the lungs.

    The Lungs

    Once the blood has been round the body and back to the heart, it enters the lungs. The lungs are made up of blood vessels which the blood travels through to collect the much-needed oxygen.The lungs are connected to the wind pipe and are made up of four main parts:the right bronchus, the left bronchus, the bronchioles and the alveoli. Not only do the lungs oxegenate blood, but they help you to breathe!

    Inside your blood

    The blood gives food, nutrients and water to the body, but what is actually inside of it? Cells travel inside the blood in a yellowish substance called plasma. Red blood cells are donut-shaped, these cells deliver oxygen to the body and inhale carbon dioxide. White cells are larger and protect the body from bacteia and viruses. Platelets (which are also a cell) clot the blood up so if there is a cut or wound, there will be less blood.

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