ANP 1105 Lecture Notes - Lecture 7: Pulse Pressure, Baroreceptor, Adipose Tissue
11 Aug 2018
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Document Summary
Delivery system of dynamic structures that begins + ends at heart. Arteries arterioles capillaries venules veins. Lumen of veins bigger than arteries + arteries are thicker than veins. Systemic circulation: arteries carry oxygenated blood, veins carry deoxygenated blood. Pulmonary circulation: arteries carry deoxygenated blood, veins carry oxygenated blood. Vessel walls arteries + veins have 3 wall layers (tunics); difference is in composition. Veins have valves that arteries don"t have. Tunica intima simple squamous endothelium that lines lumen of all vessels. Subendothelial layer: connective tissue of basement membrane; in vessels larger than 1 mm in diameter. Tunica media smooth muscle + sheets of elastin. Sympathetic vasomotor nerve fibers innervate this layer (vasoconstriction. Bulkiest, most responsible for maintaining bp + circulation. Tunica adventitia (externa) mostly of loose collagen fibers; protect + reinforce wall + anchor it to surrounding structures; infiltrated w/ nerve fibers, lymphatic vessels. Vasa vasorum: system of tiny blood vessels found in larger vessels to nourish outermost external layer.
