KN 252 Lecture 5: Circulatory System Review

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KN 252
Marone Jane, Michael Jones

Circulatory System Review Blood Vessel Structure – 3 layers of the vessel that surround the lumen (area the blood passes through/touches) 1. Tunica Intima - Intimate contact with the blood - Contains endothelium 2. Tunica Media - Contains smooth muscle for vasoconstriction (contraction) and vasodilation (relaxation) - Controls blood pressure 3. Tunica Adventitia - Composed of loosely woven collagen fibers (protects and reinforces vessel) Arteries - conducting Convey blood away from the heart. Smaller lumens/ thicker walls than veins of the same name. Resist Collapse. Tunicas are more distinct. Tunica media = thickest Artery Classification LARGE OR ELASTIC MEDIUM OR MUSCULAR SMALL or ARTERIOLES • Conduct blood away from the • Distribute blood to different body • Create resistance that slows blood heart regions flow down for exchange of • Tunica media=thickest products within the capillaries • Large lumen; 3 distinct tunicas; • Smaller lumen; 3 tunics; lots of • Largest of small arteries have 3 elastic walls smooth muscle tunics; 3-8 layers of smooth muscle • Stretch with ventricle contraction • Regulates blood supply by • Arterioles only have endothelium then recoil contracting/relaxing their smooth and smooth muscle muscle walls • Help maintain BP between • Distribute blood to organs • Regulate the distribution of blood contractions to tissues by vasoconstriction and dilation • Aorta, pulmonary trunk, major • Most named arteries in the body • Resistance vessels arteries from aorta (femoral/axillary) -Nervi vasculari (vasomotor nerves) – located in the outer layer of blood vessel for innervation of the smooth muscle in the tunica media. -Vasa vasorum (blood supply) – in larger diameter vessels; nourishes the outer layers of larger blood vessels in the body **in blood vessel structure** Capillary Classification • Smallest blood vessels; single layer of endothelial cells; allow for single blood cells to pass through in single file; 3 types CONTINUOUS FENESTRATED DISCONTINUOUS • Found in most tissues: skin, • Found in kidney, GI tract, • Found in spleen, bone marrow, muscle, lung, and CNS endocrine organs lymphoid tissue • Least permeable
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