Term
| Give the makeup for each of the 3 tunics of Arteries |
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Definition
Intima- rippled endothelium
Media- thick, dominated by smooth muscle and elastic fibers
Externa- collagen and elastic fibers |
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Term
| Give the makeup for each of the 3 tunics of veins |
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Definition
Intima- smooth endothelium
Media- thin, dominated by smooth muscle and collagen fibers
Externa- collagen and some elastic fibers and smooth muscle |
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Term
| What types of cells make up capillaries? |
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Definition
| Single layer of endothelial cells and a basement membrane(basal lamina) |
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Term
| Smooth muscle in the arteries is innervated by: |
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Definition
| neurons of the sympathetic NS (vasomotor fibers) |
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Term
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Definition
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Term
| Thin walls and large lumen: Veins or arteries? |
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Definition
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Term
| Smooth muscle dominates the tunica media of.... |
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Definition
| Medium arteries and arterioles |
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Term
| This chemical stimulates muscle contraction causing vasoconstriction |
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Definition
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Term
| T/F: Capillaries have 3 layers or tunics. |
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Definition
| False. Capillaries have one layer, only the tunica intima |
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Term
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Definition
Capillaries with endothelial cells joined by many tight junctions and occasional intercellular clefts
esp. tight in brain |
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Term
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Definition
capillary with cells partially joined by tight junctions but with numerous intracellular clefts; cells contain pores, or fenestrations
common in endocrine and urinary tracts |
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Term
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Definition
endothelial cells with few tight junctions and larger and numerous intercellular clefts and fenestrations
found in bone marrow, spleen and liver |
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Term
| What are the 3 primary kinds of capillaries? |
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Definition
| Continuous, Fenestrated, Sinusoidal |
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Term
| At any given time, most blood is in the... |
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Definition
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Term
| Physiology of circulation |
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Definition
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Term
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Definition
| force produced by blood; hydrostatic pressure; can be measured as force on vessel wall |
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Term
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Definition
| are of lumen through which blood flows, often estimated as vessel radius |
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Term
| Velocity _______ with diameter. So flow in flow in the ________ is slowest. |
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Definition
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Term
| Which types of vessel has the highest total cross sectional area? |
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Definition
| capilaries, even though they have the smallest diameter, they are so numerous that in total they have the most area |
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Term
| Blood pressure (increases or decreases?) through the vascular system. |
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Definition
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Term
| Since venous BP is low, _________ are needed to aid venous return. |
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Definition
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Term
| Types of extrinsic pumps: |
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Definition
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Term
| What factors are indirectly proportional blood flow? |
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Definition
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Term
| What factors are directly proportional to blood flow? |
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Definition
| Radius and the pressure differential |
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