BIOL 1344 Lecture Notes - Lecture 3: Tunica Intima, Tunica Externa, Oncotic Pressure
6 Feb 2017
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Document Summary
Arteries: convey blood away from the heart to the capillaries. Capillaries: microscopic, porous blood vessels for substance exchange between blood and tissues. Veins: drain blood from capillaries and convey it back to the heart. General structure: lumen inside space of the vessel, tunics. Provide a smooth surface for the blood to move through the vessel. Circularly arranged layers of smooth muscle cells supported by elastic fibers. Areolar ct that contains elastic and collagen fibers. Helps anchor the vessel to other structures. Some large blood vessels require a blood supply for the tunica externa and is supplied by small arteries called vasa vasorum that extend through the tunica externa. Companion vessels: arteries and veins the supply the same body region and are next to each other, arteries have a thicker tunica media, narrower lumen, more elastic/collagen fibers. Arteries are more resilient/resistant to changes in bp than veins. Arteries re(cid:373)ai(cid:374) ope(cid:374) e(cid:448)e(cid:374) (cid:449)he(cid:374) there is(cid:374)"t (cid:271)lood prese(cid:374)t.
