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Your heart is a muscle about the size of your fist. The heart pumps blood through a network of blood vessels to the lungs where it picks up oxygen. The 'oxygen rich' blood is then returned to the heart so it can be pumped onto the organs and tissues throughout your body.
There are two main types of blood vessels which carry blood:
'arteries' carry the oxygen rich blood from the heart to the organs and tissues
'vein's' transport the blood back to the heart from the organs and tissues
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