Exam #2: Hemodynamics Flashcards
In hemodynamics, how is the venous system described? What does a change in the radius of a vein lead to?
The venous system is referred to as a capacitance system.
- Change in radius= change in volume
In hemodynamics, how is the arterial system described? What does a change in the radius of an artery lead to?
The arterial system is referred to as a resistance system.
- Change in radius= change in pressure
List the characteristics of arteries,
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List the characteristics of arteroles.
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List the characteristics of capillaries.
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List the characteristics of venules.
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List the characteristics of veins
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Elastic fibers vs. collagen fibers.
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Pressure changes in circulatory system?
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List the three basic principles of hemodynamics.
1) The rate of blood flow to an organ/ tissue is related to its need (more need= more flow)
2) Cardiac output is controlled by the sum of individual tissue needs
3) Arterial pressure regulation is independent of local blood flow or cardiac output control
How is arterial pressure regulated?
Short-term= nervous reflexes Long-term= hormones
What are the units of blood flow?
Volume/ time
cm3/sec
Write Ohm’s law for blood flow using symbols. What is Ohm’s law for blood flow?
Flow is equal to the pressure gradient, divided by the resistance.
Thus, flow is directly proportional to the pressure gradient, & flow is indirectly proportional to the resistance.
Write Poiseuill’s law for rigid tubes.
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What is viscosity?
Internal friction of the fluid