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Definition
many elastic fibers; incl: aorta and its branches; keeps BP constant
The biggest arteries. |
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many muscular fibers; incl: majority of arteries; delivers blood to rest of body
Delivers blood to specific organs. |
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Definition
| smaller distributing arteries |
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| contains mostly smooth muscle; regulates blood delivery and BP; brings blood to capillaries |
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| Link arterioles to capillaries. |
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Definition
contain 1-way valves to prevent backflow of blood;“capacitance” vessels--blood reservoirs (54% of blood at rest); irregularly shaped; thicker tunica externa and thinner tunica media than arteries; rely on “skeletal muscle pump” for venous return
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Definition
| smaller, thin-walled vein that connects to a capillary; very leaky |
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| Valves become stretched after being dilated for long periods of time |
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Simple sqamous epi and basement membrane. "exchange" vessels--brings blood to tissues to exchange O2/CO2 ; Small diameter, scarce in ligaments,tendons, epithelium, cornea, lens of eye, and most cartilage.
Usually connect arteries (arterioles) to veins (venules)
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Definition
§epithelial cells are held together with tight junctions with intercellular clefts to allow fluid passage; abundant in the skin and muscles; form blood-brain barrier. |
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Definition
epithelium riddled with filtration pores (fenestrations) which increases vessel permeability to solutes and fluid; found wherever active capillary absorption or filtrate formation occurs (e.g., small intestines, endocrine glands, and kidneys). |
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Term
Sinusoidal Capillaries (discontinuous capillaries)
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| Highly modified, leaky, capillaries with large diameters; found in the liver, bone marrow, lymphoid tissue, and in some endocrine organs |
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Term
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Definition
metarteriole–thoroughfare channel connecting an arteriole directly with a postcapillaryvenule; bypasses true capillaries. |
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Term
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Definition
| 10 to 100 per capillary bed, capillaries branch off the metarteriole and return to the thoroughfare channel at the distal end of the bed; regulated by precapillary sphincter; blood flow is slow to allow for gas exchange in tissues |
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Term
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Definition
provide alternate pathways (collateral
channels) for blood to reach a given
body region
thoroughfare channels are examples of
arteriovenous anastomoses
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Definition
smooth blood flow; flow is faster in center and slower along vessel wall (encounters friction); seen in smaller vessels (arterioles). |
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Definition
Flow is disrupted due to constriction or vessel curve, "audible"; seen in larger vessels.
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Definition
| growth of new blood vessels overtime. |
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Definition
| receptors in cartoid arteris & aortic arch detect low oxygen levels to release nitric oxide which dilates vessels to increase blood flow |
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Definition
Medulla Oblongata sends SNS impulses to increase vasoconstriction of vessels.
Low SNS results in vasodilation |
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Term
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Definition
The narrowing of a vessel.
A rise in epi/norepi, renin, angiotensin II and ADH increase vasoconstriction of vessels. |
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