Blood vessels are hollow tubes that are distributed throughout our body and circulate blood.
An adult's body has abot four to six litres of blood in this closed circuit.
There are three types of blood vessels:
- Arteries are thick. Arteries carry blood away from the heart to other organs.
- Veins are thick. Veins carry blood back to the heart.
- Capillaries connect veins and arteries. They are thin and fragile.
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| There are three types of blood vessels. |
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