Popular in Basic Human Anatomy
Popular in Anatomy
This 2 page Class Notes was uploaded by Cierra Beyers on Wednesday March 25, 2015. The Class Notes belongs to ANAT-A215 at a university taught by Steve Dougherty in Fall. Since its upload, it has received 170 views.
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Date Created: 03/25/15
CIRCULATORY SYSTEM VESSELS Blood vessels blood flows from the heart and ultimately back to the heart through these vessels heart arteryarteriolecapillaryvenulesvein head A Structure arteries and veins have 3 tunics 1 Tunica Externa adventitia outermost loose connective tissue this is the thickest layer in veins 2 Tunica Media middle smooth muscle layer this is the thickest layer in arteries 3 Tunica lntima innermost a Endothelium simple squamous and connective tissue b Subendothelial layer ct ll Arteries carry blood away from heart A Elastic large amount of elastin in tunica media largest most expandable 0 Example aorta and branches B Muscular very little elastin tunica media is predominantly smooth muscle There is an elastic lamina inner and outer on each edge of the tunica media 0 Example arteries in extremities C Arterioles smallest microscopic with all three layers tunica media very thin lt10 layers lll Capillaries quotFunctional unitsquot of circulatory system very thinwalled allows for exchange of gases nutrients amp waste products Composed of a tunica intima ONLY an endothelium and connective tissue lV Venules usually lack a tunica media They have the other two tunics 0 They unite to form veins 0 No smooth muscle V Veins carry blood to the heart All 3 tunics present Most but not all veins have valves prevent backflow Veins have a very low pressure amp large lumens Because of the low pressure and large lumens the blood flow through them is dependent on A Contraction of surrounding musculature skeletal muscle pump B Oneway valves to prevent backflow Which of the following allow for exchanges between the blood stream and the ssues a Muscular artery c Venule d Arteriole e Elastic artery
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