BIOS-1113 Lecture Notes - Lecture 2: Tunica Intima, Tunica Externa, Simple Squamous Epithelium
7 Aug 2018
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Blood vessels composed of: gases, nutrients, waste products, hormones closed. Blood vessels are tubular structures possessing an opening called a ____________> this opening is surrounded by a wall composed of layers called ____________. tunica externa. Superficial layer of the blood vessel composed of connective tissue. The artery is thicker than the vein tunica media. Middle layer of the blood vessel composed of smooth muscle. Regulates diameter of vessel by vasodilation and vasoconstriction vasodilation relaxes to increase diameter vasoconstriction constricts to decrease diameter tunica intima. Carry blood away from the heart and transport it to the tissues. Have all 3 tunics but differ from other vessels because some have elastic fibers that allow them to expand and recoil elastic, expand, recoil, high, high. Arteries have __________ fibers that allow them to __________ and _________. Blood passing though these vessels is under ________ velocity and ________ pressure.
