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UB ANA 113 Lec 23/24

Blood Vessels

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
Created by: HugsAndKisses



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