HUMB1004 Study Guide - Final Guide: Tunica Intima, Tunica Media, Smooth Muscle Tissue
4 Aug 2018
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Layers : tunica intima = endothelial cells and basement membrane (protein scaffold collagen to keep cells in place, tunica media = smooth muscle + elastin, tunica externa (adventia) Need blood supply, so some large blood vessels might have blood vessels on them = vaso. Valves allow blood to flow towards the heart only, blood is pumped and as it passes the valve closes. Very thin, has a layer of smooth muscle. Can regulate vessel diameter because bp in venous system is low. Veins are volume reservoirs- so valves needed so blood flows only towards the heart. 2/3 of blood in body is in some vein/venule somewhere. Whe(cid:374) people are i(cid:374)a(cid:272)tive, they have(cid:374)"t (cid:271)ee(cid:374) usi(cid:374)g their skeletal (cid:373)us(cid:272)les, therefore ve(cid:374)ous retur(cid:374) is i(cid:373)paired, and venous stasis can occur. Venous stasis (decreased blood flow within the veins) can leave a patient vulnerable to deep vein. Why some people on long flights wear compression stockings.
