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BloodFlowImages - Arteries AWAY Branch Typically oxygenated...

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Arteries AWAY Branch Typically oxygenated .
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Capillaries Smallest. Most abundant. How many?? Why? Exchange
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Veins TOWARDS Converge. Typically deoxygenated .
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3 Layers of the Vascular Wall Tunica interna Tunica media Tunica externa.
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Tunica Interna/Intima Lining. Endothelium. Supported by loose CT. Only layer in capillaries.
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Tunica Media Primarily smooth muscle plus elastic fibers. Most prominent layer in arteries.
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Tunica Media Smooth muscle tone Regulated by: Metabolites Hormones Sympathetic vasomotor neurons.
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Vasomotor neurons constantly release NE onto TM smooth muscle. What does the NE do? Why have a constant release?
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Increased NE release by a vasomotor neuron causes: Tunica media smooth muscle tone to: Vessel diameter to: Resistance to blood flow in the vessel to: Blood flow thru the vessel to:
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This gentleman has fatty plaques in his lower leg arteries. How do you think they affect blood flow? How does that relate to his facial expression? His doctor recommends that the sympathetic nerves to those arteries be cut. Why?
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Tunica Externa/Adventitia Primarily collagen Function? Most prominent layer in veins
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Elastic Arteries Aorta and major branches. Act as AUXILIARY PUMPS.
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Regional distribution Significant layer Muscular Arteries
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Smallest. May or may not have an externa. Highly innervated by vasomotor neurons.
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