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Types of blood vessels:
1. Arteries
⇒thick walled blood vessels
⇒carry oxygenated blood away from the heart  to the cells, tissues and organs of the body.
⇒Aorta is the largest artery.

2. Capillaries
⇒ the smallest blood vessels in the body found in all organs where exchange of substance occur.
⇒the actual site where gases and nutrients exchanged.

3. Veins
⇒ thin walled blood vessels that carry deoxgenated blood to the heart.
⇒largest veins is the superior and inferior vena cava.

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