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What are the 5 types of blood vessels
1.arteries
2.arterioles
3. Capillaries
4. Venules
5. Veins
What are the three walls of the arteries
Tunica interna
Tunica meDia
Tunica externa
Describe the tunica interna
Innermost layer
Touches lumen
Made of smooth muscle (elastic lamina), endothelium (endothelial cells), and basal membrane
Describe the tunica media
The middle layer
Involved in vasodilation and vasoconstriction
Made of elastica lamina and smooth muscle
Describe the tunica externa
Outermost layer
Supplies nerves and anchors vessels to tissues
Does NOT regulate blood flow
Where do arteries transport blood
From the heart to tissues and organs
What are the two groups of arteries?
Elastic
Muscular/distributing
Describe elastic arteries (aka conducting arteries)
Largest
Elastic fiber
Expand during contraction
Recoil during relaxation
Pushes blood further away
Describe muscular ( aka distributing arteries)
Medium
Branch from elastic arteries
Thick tunica media (vasodilation/vasoconstriction)
Distribute blood to skeletal muscle and internal organs
What are arterioles
Larger arterioles have all three tunics
Very small arteries only have tunica interna (incomplete media) and smooth muscle
Regulate blood flow into capillaries
(Via resistance)
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