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blood vessels
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artery
carry blood away from the heart
veins
carry blood to the heart
capillary
vessels that return blood to the heart
what enters/exits capillaries?
oxygen and nutrients enter, carbon dioxide and waste leave
arteriole
small arteries
venule
small veins
tunica intima
endothelium lining, reduces friction
tunica media
smooth muscle/elastic tissue, controlled by sympathetic nervous system
tunica externa
mostly fibrous CT, supports and protects vessel
systole
contracton
diastole
relaxation
circle of willis
arterial supply to brain
hepatic portal vein
supplys blood to the liver
venous thrombosis
blockage of a vein caused by a blood clot