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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 |