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10 Cards in this Set
- Front
- Back
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List the five types of blood vessels in order from the heart to the back of the heart.
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Arteries, arterioles, capilaries, venules, veins
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Define vasodilation
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When muscles relax and the diameter of the vessels increase.
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Define vasoconstricion
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Impulses traveling on vasomotor fibers cause muscles to contract and reduce diameter of vessels.
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Describe the composition of veins.
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Has all three tunics but walls are thinner and contain less smooth muscle and elastic fibers than arteries. Externa is thickest layer.
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What are the smallest blood vessels and describe their composition.
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capillaries, their walls are composed of a single layer of endothelium.
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Fenestrated capillaries
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contain numerous pores (fenestrations). Absorbs nutrients, movement of hormones and filtration.
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Continuous capillaries
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continuous- most common and are abundant in skin and muscles.
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Capillary beds.
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highly branched networks composed of venticular shunts and true capillaries.
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State the function of capillaries and state the mechanisms of exchange.
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Main exchange by diffusion. Also by osmosis and filtration. Interchange substaces b/t blood and tissue cells.
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Describe the exchange of oxygen and carbon dioxide in the capillaries.
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Oxygen- diffuse out of blood into tissue cells. Carbon dioxide- diffuse from tissues into blood of capillaries.
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