09_HemodynamicsAndRegulationofBloodFlow

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What is Poiseuille's Law?
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What is Poiseuille's Law?
Defines flow through a tube based on pressure and resistance.
What is the equation for Poiseuille's Law?
Q = Pi - Po / R
What is the relationship between flow and pressure gradient?
Flow is proportional to the pressure gradient.
What is the relationship between flow and resistance?
Flow is inversely proportional to resistance.
What is the equation for Ohm's Law?
I = V / R
What is the relationship between current flow and voltage drop?
Current flow is proportional to voltage drop.
What is the relationship between current flow and resistance?
Current flow is inversely proportional to resistance.
What is the force that drives flow in the cardiovascular system?
The pressure gradient across the tube.
What is the most important determinant of resistance?
Radius of the tube.
How does resistance change with radius?
Resistance is inversely proportional to the radius to the fourth power.
What happens to flow when the radius is increased?
Flow increases exponentially.
What happens to resistance when the radius is increased?
Resistance decreases exponentially.
What happens to flow when the radius is decreased?
Flow decreases exponentially.
What happens to resistance when the radius is decreased?
Resistance increases exponentially.
What determines resistance in the cardiovascular system?
Changes in the radius of arterioles.