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### 25 Cards in this Set

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 What is hemodynamics? The study of physical principles of blood circulation. What is blood? A vicous fluid made of cells and plasma What are RBC's? The major component of blood Biconcave disks 7um in diameter Give signal to doppler What is viscosity? The thickness of blood. The thicker the blood (more RBC's) the more viscous it is. Anemia=low RBC=low viscosity How blood moves through the vessels: Blood flows to path of least resistance Pressure is applied to a vessel Blood is propelled through the vessel by a pressure drop What does resistance determine and what changes it? How and where blood flows Changed by viscosity, vessel lumen radius, frictional effects What is laminar flow? When blood flows in layers The center stream is always the highest velocity in this flow. What is volume flow rate? The amount of blood flowing through a vessel per unit of time Too fast=stenosis Too slow=blockage Two biggest components to Poiseulle's equation: *Small radius changes make a difference (x4) in volume flow *Volume flow is altered by pressure differences along the length of a vessel Poiseulle's concepts Inverse relationship (change increases, flow rate increases, radius doesn't) Vessel length I, volume flow rate D Viscosity I, volume flow rate D Static filling pressure When vessels fill, the walls expand. When the vessel returns to its orginal shape, this pressure is called _________. What is hydrostatic pressure? The weight of fluid in a column/the weight of blood when standing due to gravity. In general circulation, what is considered the reference point, or 0 hydrostatic pressure? The atrium Anything above the reference point is _________ Anything below is a _________ pressure shift Negative Positive What is ABI? Ankle-Brachial-Index Bernoulli's principle states that total fluid energy consists of: Kinetic energy, potential energy, and work done when pressure is applied. What does Bernoulli's predict? Pressure drops greatly across a stenosis as a reults of energy loss on the post stenotic region. What is pulsatile flow? Blood flow that reflects the phases of the heartbeat Used in arterial flow only What is systole? Forward flow sent through the peripheral system What is early diastole? Area of tempory flow reversal What is late diastole? The forward flow reflective wave hits the proximal resistance to the next oncoming wave and then reverses. What is intraluminal pressure? Pressure exterted on the walls from the fluid within blood What is tissue pressure? Pressure exterted on the vessel from outside structures What is transluminal pressure? The difference between the intraluminal and tissue pressure, or the pressure on the wall itself When does turbulence occur? After Revnolds number