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Upload 12.20 Blood Vessel Notes to eBackpack

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

Arterioles Similar to arteries in function but smaller

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

Venules Similar to veins in function but smaller

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 

How do arteries and veins compare?

Observing blood vessels Link

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