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blood vessels
test 2
Term | Definition |
---|---|
pulmonary circuit | capillaries going to the lugs where blood becomes oxygenated; the heart and lungs |
systemic circuit | oxygen leaves the blood and CO2 enters the blood from the muscles; the limbs of the body |
arteries | always carry blood away from the heart; high blood pressure; thicker walls; never have valves |
veins | carry blood toward the heart; low blood pressure; thinner walls; may have valves |
elastic (large) arteries | aorta, pulmonary trunk and their close branches |
muscular (medium) arteries | distribute blood to head, limbs and organs |
arterioles | distribute blood withing organs and tissues |
capillaries | primary site for exchange of gases, nutrients, ions, wastes, hormones, cells, etc; smallest of blood vessels |
venules | gather blood from capillaries; also some exchange of same materials as capillaries |
small veins | gather blood from tissues |
medium veins | gather blood from head, limbs and organs |
large veins | return blood to heart |
endothelium | entire circulatory system is lined by this simple squamous epithelium |