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Related Flashcards
Cards In This Set
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What three layers do both arteries and veins share?
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Tunica Externa (Adventitia) Tunica Media, and Tunica Interna
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Describe the structure of the Tunica Externa.
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The outermost layer, and has loosley woven collagen fibers
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What is the function of the tunica externa?
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Holds vessels in place and prevents tearing of vessels during body movements
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What does the tunica externa also contain?
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Vasa Vasorum
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What is the vaso vasorum?
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Tiny vessels that provide blood to layer of larger vessels
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Describe the structure of the Tunica media.
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The middle/ muscle layer, its circularly arranged smooth muscle tissue with sheets of elasin
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Is the tunica media thicker in veins or in arteries?
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Veins
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What is the function of the tunica media?
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Permits change in blood vessel diamter (vasoconstriction and vasodialation) which is regulated by the sympathetic vasomotor nerve fibers
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Describe the structure of the tunica interna (intimia)
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The innermost layer, has endothelium (simple squamous) lining and is continuous with the endocardium of the heart
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What does the tunica interna (intimia) or the endocardium of the heart become?
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The endothelium of blood vessels
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What does the arterial system do?
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Carries blood away from the heart
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What are elastic arteries?
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The conducting vessels, thick walled arteries near the heart
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Name some example of elastic arteries.
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Pulmonary arteries, aorta, common carotid arteries
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What are the characteristics of elastic arteries
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Elastin enables vessles to withstand and smooth out large pressure fluctuations resulting in continuous blood flow rather than pulsating rhytm
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What are muscular arteries?
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The distributing arteries, the named vessles carrying blood to specific organs
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