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UB ANA 113 Lec 23/24
Blood Vessels
| Question | Answer |
|---|---|
| Functions of blood vessels | transport oxygen, nutrients, wastes, and hormones |
| lumen | opening |
| tunic | layers of blood vessel walls |
| Tunica intima | simple squamous epithelium. Innermost layer |
| Tunica media | middle layer. Smooth muscle. Changes vessel diameter. ANS regulates |
| Tunica Externa | outermost layer. CT (collagens) |
| vaso vasorum | in larger vessels (thick). "vessel of vessels". Supply vessel walls. |
| arteries | 3 tunics, thick tunica media. elastic fibers in walls |
| arterioles | 3 tunics, tunica media regulates blood flow to capillaries** |
| capillaries | endothelium only. Thin, permeable |
| venules | 3 tunics, thin, low pressure |
| veins | 3 tunics, fewer smooth muscles then arteries. Larger lumen, Contains valves to prevent blood from trickling down by gravity |
| Why is the capillary level favorable for exchange? | thin walled and permeable |
| effect of the ANS sympathetic stimulation | constrict blood vessels of abdominal viscera. Dialate blood vessels of heart and skeletal muscle using smooth muscle in tunica media |
| hepatic portal circulation | blood from organs fuse into portal vein |
| Where does blood enter the liver? | hepatic artery and portal vein |
| Function of the liver in relation to blood | screen blood for toxins. Can store glucose |
| Hepatic artery | supplies the liver w/ oxygenated blood |
| Portal vein gets blood from ... | superior mesenteric vein, inferior mesenteric vein, and splenic vein |
| hepatic vein | drains blood from the liver, empties into inferior vena cava |