Chapter 20 CS continued
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1) Arteries carry blood away from the heart
2) Veins carry blood towards the heart
3) Capillaries connect veins and arteries to one another
What are the 3 layers of vessel walls?
- 1) Tunica interna
- 2) Tunica media
- 3) Tunica externa
- - Selective permeable membrane
- - Secretes chemicals to vasodilate or contrict
- - It can help repel platelets from sticking together unless injured or inflammed
- Is the thickest
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