1. Upload 12.20 Blood Vessel Notes to eBackpack

2. Aorta Arteries Pulmonary Artery Carry blood away from the heart
Thick walls- carry fast and furious rush of blood
Elastic
Very smooth- to help prevent clots
Constrict and dilate based on nerve impulses
No valves

3. Arterioles
Similar to arteries in function but smaller

4. Capillaries Smallest blood vessels
Gas exchange at a cell low in oxygen
Smallest blood vessels
Blood cells line up one at a time to pass through
Site of gas exchange
Gas exchange at the lungs

5. Venules
Similar to veins in function but smaller

6. Superior vena cava Pulmonary veins Inferior vena cava Veins
Carry blood to the heart
Thinner walls- carry slow and easy flow of blood
Less elastic (but better able to stretch)
Smooth 
 Constrict and dilate based on nerve impulses
Valves 

7. How do arteries and veins compare?

9. Observing blood vessels
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