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21 Cards in this Set
- Front
- Back
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Increased intravascular pressure distends vessels causing what
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decrease resistance to blood flow
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What is systemic vascular resistance (SVR) or vascular resistance caused by
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friction between flowing blood and the vessel endothelium
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Increased vascular resistance means what for the pressure gradient
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a greater pressure gradient is required for downstream blood flow
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In humans circulatory system, a variable exists allowing blood flow to increase how much
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4-6 X while mean arterial blood pressure increases 2X
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flow is fastest for the central stream and slowest for the streams that are closest to the vessel wall
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laminar flow
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streamlined flow through long, smooth vessels
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laminar flow
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this flow normally occurs throughout most of the vascular system
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laminar flow
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each stream remains the same distance from the vessel wall with no mixing of streams
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laminar flow
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blood flow streams mix within vessels forming eddy currents
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turbulent flow
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turbulent flow tendency increases with what?
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increased flow velocity, increased blood vessel diameter and decreased fluid viscosity
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normally exhibited in the proximal aorta and pulmonary artery during ventricular ejection
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turbulent flow
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this flow occurs with small diameter vessels, decreased flow velocity and increased fluid viscosity
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laminar flow
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this flow occurs with large diameter vessels, increased flow velocity and decreased fluid viscosity
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turbulent flow
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Name some pathologic causes of turbulent blood flow
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abnormal heart valve structure, atherosclerosis, coarctation of the aorta and anemia
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vessel narrowing
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atherosclerosis
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may hear bruits with or without a stethoscope
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pathologic cause of turbulent blood flow in atherosclerosis
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Name a non pathologic cause of turbulent blood flow
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korotkoff sounds
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Poiseuille's Law: Resistance
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increased blood viscosity or increased vessl length = increased resistance to blood flow; increased vessel diameter = decreased resistance to blood flow
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according to Poiseuille's Law: the major variable affecting vascular resistance is what
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vessel diameter
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according to Poiseulille's Law: tissue lood flow is regulated by what
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changing the diameter of small arterioles by SNS input, hormone action and vasoconstrictor and vasodilator substances
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according to Poiseuille's Law: vascular resistance does what as the number of blood vessels running in parallel increases
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decreases
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