Term
| What are the three major types of vessels? |
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Definition
| Arteries, Capillaries, and Veins |
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Term
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Definition
| Carry blood away from the heart |
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Term
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Definition
| Carry blood toward the heart |
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Term
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Definition
| Contact tissue cells and directly serve cellular needs |
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Term
| What are arteries and veins composed of? |
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Definition
Three tunics-interna, media, externa-
Lumen
Capillaries |
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Term
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Definition
| Central blood containing space surrounded by tunics |
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Term
| What are capillaries composed of? |
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Definition
| endothelium with sparse basal lamina |
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Term
| Tunica Interna made of? Lines? |
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Definition
| Endothelial layer that lines the lumen of all vessels |
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Term
| Tunica interna in large vessels has an extra layer of ________ tissue called |
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Definition
| connective tissue called subendothelial |
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Term
Tunica media is made up of?
Regulated by? Controls |
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Definition
Smooth muscle and elastic fiber that regulate by sympathetic nervous system
Controls vasoconstriction/vasodialation |
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Term
Tunica externa... Another name for it. Made of? Function?
Large vessels contain vaso vasorum |
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Definition
Tunica Adventititia
Made of collagen fibers that protect and reinforce vessels
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Term
| Larger vessels of tunica externa contain vas ________ |
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Definition
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Term
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Definition
| Vessels of vessels... nourish external tissues of blood vessel walls. |
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Term
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Definition
| The joining together of two blood vessels or other tubular structures to furnish a direct or indirect communication between the two structures. |
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Term
| What are 2 structural characteristics of the arteries closest to the heart? |
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Definition
Large Lumen
Contain elastin in all three tunics
Thick walled |
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Term
| What does the large lumen, thick wall and elastin function in the arteries near the heart? |
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Definition
Large lumen allow low resistanc conduction of blood
Elastin enables the arteries to withstand and smooth out large blodo pressure fluctuations
Serve as pressure reservoirs. |
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Term
| Muscular arteries function/location? |
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Definition
| Deliver blood to body organs. Distal to elastic arteries |
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Term
| Muscular arteries structural characteristics? Major function? |
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Definition
| Thick tunica media with more smooth muscle. Active in vasoconstriction |
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Term
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Definition
| Smallest arteries which lead to capillary beds |
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Term
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Definition
| Control flow into capillary beds via vasodilation and constriction |
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Term
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Definition
| Smallest blood vessels which allow only a single RBC to pass at a time. |
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Term
Capillaries structural characteristics
Walls consist of? |
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Definition
thin tunica interna (one cell thick)
Pericytes on the outer surface stabilize their walls. |
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Term
| What are the 3 types of capillaries? |
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Definition
1.Continuous
2.Fenestrated
3.Sinusoids |
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Term
| Where are contiuous capillaries found |
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Definition
| Abundant in the skin and muscles and the brain |
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Term
| Structural characteristics of contiuous capillaries? Endothelial cells, Adjacent cells, Intercellular clefts |
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Definition
Endothelial cells provide an uninterupted lining
Adjacent cells are connected with tight juctions
Intercellular clefts allow the passage fo fluids |
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Term
| What is the basement membrane composed of? |
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Definition
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Term
| What do the continous capillaries of the brain make up? What structural characteristic sets it apart? |
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Definition
Constitute the blood brain barrier
They have tight junctions completely around the endothelium |
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Term
Where are fenestrated Capillaries found?
Function? |
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Definition
Small intestines, Endocrine glands, Kidneys
Active capillary absorbtion or filtrate formation occurs. |
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Term
| What does fenestrated mean. Size of fenestrations |
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Definition
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Term
| Fenestrated capillaries characteristics |
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Definition
An endothelium riddled with pores
Greater permeability than other capillaries |
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Term
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Definition
| highly modified, leaky, fenestrated capillaries with LARGE lumens. |
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Term
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Definition
| Liver, bone marrow, lymphoid tissue other endocrine organs |
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Term
Sinusoid function
What speed does blood flow in sinusoids? |
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Definition
Allow large molecules such as proteins and blood cells to pass between the blood and surrounding tissues.
Sluggishly |
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Term
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Definition
| a microcirculation of interwoven networks of capillaries consisting of vascular shunts and true capillaries. |
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Term
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Definition
| metarteriole-throughfare channel connection an arteriole directly with a postcapillary venule |
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Term
True Capillaries
Number per capillary bed? |
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Definition
| 10 to 100 per capilary bed, capillaries branch off the metarteriole and return to the throroughfare channel at the distal end of the bed. |
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Term
Precapillary sphincters function?
Composed of? |
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Definition
| a valve that can be stimulated to contract thus halting the flow of blood to the capillary bed. Smooth muscle |
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Term
| Blood flow from artery to vein |
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Definition
| goes from a terminal arteriole to a postcapillary venule |
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Term
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Definition
| cuff of smooth muscle that surrounds each true capillary and regulates blood flow into the capillary |
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Term
| Precapillary sphincter blood flow regulation? |
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Definition
| Vasomotor nerves and local chemical conditions. |
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Term
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Definition
allow fluids and WBCs to pass from the blood stream to tissues
capillary beds unite |
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Term
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Definition
| Smallest venules composed of endothelium and a few preicytes |
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Term
Large venules
Contain what kind of tunica? |
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Definition
| have one or two layers of smooth muscle (tunica media) |
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Term
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Definition
| Formed when venules converge |
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Term
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Definition
Thin tunica media
Thick tunica externa consisting of collagen fibers and elastic netwarks |
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Term
| Two special characteristics of veins which allow them to return blood to the heart. |
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Definition
1.Large diameter lumens which allow for little resistance to flow
2.Valves which prevent backflow |
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Term
Venous sinuses Define
2 examples |
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Definition
| Specialized flattened veins with extremely thin walls Coronary sinus of the heart and dural sinuses of the brain |
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Term
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Definition
| Merging blood vessels, more common in veins than arteries. |
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Term
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Definition
| provide alternate pathways for blood to reach a given body region. |
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Term
Venous anastamosis
Example? |
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Definition
veins interconnect
Example dorsum of hand |
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Term
Venous anastamosis
Example? |
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Definition
veins interconnect
Example dorsum of hand |
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