Five main types of blood vessels

arteries, arterioles, capillaries, venules, and veins

Arteries

-A blood vessel that carries blood away from the heart.
-continuously divide into medium, and branch out into the body.
-medium arteries further branch into smaller arteries called arterioles.

arterioles

-enter tissue and branch out into capillaries.

capillaries

-have thin walls which allow for exchange of substances between the blood and tissues.

venules

-small veins formed by groups of capillaries.
-these small venules merge to form progressively larger blood vessels called veins.

veins

- blood vessels that convey blood from the tissues back to the heart.

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