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14 Cards in this Set
- Front
- Back
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Blood Vessels
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An efficient mode of transport for oxygen, nutrients, and waste products to and from body tissues.
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Systemic circulation consists of
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the blood vessels that extend to and from the body tissues.
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Pulmonary circulation consists of
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the vessels that take the blood to the lungs for gas exchange.
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Three Main Classes of Blood Vessels
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Arteries, Veins, and anastomosis
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. Describe the three tunics in most blood vessels.
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Tunical Intima, Tunica Media, Tunical Externa
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Veins carry blood...
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To the heart
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Arteries carry blood...
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away from the heart
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anastomosis
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Site where two or more vessels merge to supply the same body region
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Tunica Intima, or Tunica Interna
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innermost layer of a blood vessel wall
composed of an endothelium and a subendothelial layer |
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Tunica Media
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middle layer of the vessel wall
composed of circularly arranged layers of smooth muscle cells vasoconstriction (narrowing of the blood vessel lumen) vasodilation (widening of the blood vessel lumen) |
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Tunica Externa, or Tunica Adventitia
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outermost layer of the blood vessel wall
composed of an areolar connective tissue that contains elastic and collagen fibers helps anchor the vessel to other tissues |
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Three basic types of arteries
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elastic arteries, muscular arteries, and arterioles
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as an artery’s diameter decreases
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corresponding decrease in the amount of elastic fibers
relative increase in the amount of smooth muscle |
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Capillaries
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Contain only the tunica intima, but this layer consists of a basement membrane and endothelium only.
Allow gas and nutrient exchange between the blood and the body tissues to occur rapidly. Smallest blood vessels, connect arterioles to venules. Are called the functional units of the cardiovascular system. A group of capillaries (10–100) functions together and forms a capillary bed. |
