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16 Cards in this Set
- Front
- Back
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Artery Function |
carry blood away from the heart |
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Vein Function |
carry blood toward the heart |
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Three layers of blood vessels |
Tunica Intima |
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Tunica Intima |
containts endothelium (simple squamous epithelium) and minimizes friction through the lumen |
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Tunica Media |
is mostly smooth muscle cells and sheets of elastin; causes either vasoconstriction or vasodialation |
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Tunica Externa |
Loosley woven collagen fibers; protects and reinforces the vessel and anchors it to surrounding structures |
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Arterial System |
Elastic Arteries, muscular arteries, and arterioles |
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Elastic Arteries and Functions |
thick walled arteries near the heart (aorta and its major branches); pressure reservoirsm expanding and recoiling as the heart ejects blood |
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Muscular Arteries and Functions |
Thickest tunica media of all arteries with an elastic membrane on each face of tunica media. Deliver blood to specific organs; more active in vasoconstriction and less distendible |
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Arterioles |
smallest of the arteries have all three tunics but their tunica media is chiefly smooth muscle; lead to capillary beds |
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Capillaries |
smallest blood vessels that consist of just a thin tunica intima |
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Capillary Types |
continuous capillaries fenestrated capillaries sinusoid capillaries |
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Continuous Capillaries |
abundant in the skin and muscles endothelial cells joined by tight junctions allow limited passage of fluids and small solutes |
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Fenestrated Capillaries |
endothelial cells are riddled with oval pores (fenestrations) more permeable to fluids and small solutes found wherever absorption or filtrate formation occurs |
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Sinusoid Capillaries |
leaky capillaries found only in the liver, bone marrow, spleen, and adrenal medulla have large, irregularly shaped lumens are usually fenestrated |
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Capillary Beds |
interweaving capillary networks |
