KNES 260 Study Guide - Midterm Guide: Thymus, Tachycardia, Circulatory System
30 Apr 2016
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Systemic arteries carry oxygenated blood from heart to tissues. Pulmonary arteries carry deoxygenated blood from heart to lungs. 3 layers: tunica adventitia outer layer, tunica media middle layer, tunica intima inner layer. Has a smooth inner lumen, and elastic lamina to maintain shape. 3 types: elastic largest in size, allow for high degree of expansion between beats. E. g. abdominal aorta: muscular distributing arteries, regulate flow of blood to different body parts. E. g. femoral artery: arterioles narrow lumina, thick muscular walls. Blood pressure mainly regulated by degree of muscular tone. Systemic veins return deoxygenated blood from tissues to heart. Pulmonary veins return oxygenated blood from lungs to heart. Thinner walls due to lower blood pressure poorly developed muscular tone. 3 types: large wide bundles of smooth muscle, well developed tunica adventitia. Ivc: medium have valves to maintain direction of flow, musculovenous pump, less pressure, against gravity. E. g. great saphenous vein: small unite to form venous plexuses.
