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Lab 6 - Peripheral Circ Lymph Histo

Lab 6 - Peripheral Circ Lymph Histo - Peripheral...

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Peripheral Circulation
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Peripheral or Systemic Circulation Arteries Carry blood AWAY from the heart Carry oxygenated blood (different from pulmonary circulation) Split/branch Arteries arterioles capillaries Veins Carry blood TOWARD the heart Carry deoxygenated blood (different from pulmonary circulation) Merge/join Capillaries venules veins
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Same structure for most blood vessels: Walls surround a lumen (central space) Walls have 3 layers called tunics: Tunica intima endothelium (simple squamous epithelium) subendothelial layer (loose CT layer in <1mm vessels) Tunica media circularly-arranged smooth muscle fiber sheets sheets of elastin & collagen between muscle sheets vasoconstriction (contraction), vasodilation (relaxation) Tunica externa Longitudinal layer of CT with collagen & elastin fibers
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Capillaries have a different structure:
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Three Types of Arteries Elastic arteries 1–2.5cm diameter Muscular arteries .3mm – 1cm diameter Arterioles 10µm-0.3mm
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Elastic Arteries Largest arteries (1-2.5cm diameter) Comprise major distribution vessels Aorta, brachiocephalic A, common carotid AA, subclavian AA, pulmonary AA Tunica media broad and very elastic Contains many elastin fibers Tunica externa contains vasa vasorum , small blood vessels that supply the outer wall of the artery with blood
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Elastic Artery Thick tunica media Many elastin fibers in tunica media Elastin fibers stain black Vasa vasorum in tunica externa
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Elastic Artery
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tunica intima tunica externa tunica media
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Muscular Arteries Medium-diameter arteries (.3mm–1cm) These are the arteries that you can dissect in a cadaver (not including the elastic arteries) ulnar AA, femoral AA, coronary AA, vertebral AA Tunica media extremely broad Mostly comprised of circular smooth muscle Surrounded by internal & external elastic lamina Lumen small relative to elastic arteries Tunica intima very thin
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Muscular Artery
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Muscular Artery
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Muscular Artery
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Arterioles Smallest diameter arteries (10µm–0.3mm) Terminal branches of the arterial system that supply capillary beds Tunica media very thin one or two layers of smooth muscle cells Large arterioles: 3 tunics and internal elastic lamina Small arterioles: 1 layer of smooth muscle cells spiraling around an endothelium
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Small Arteriole
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