1.2 Hemodynamics 24-31 Flashcards
hemodynamics is about the relationship between ____, _____, and ______ in the cardiovascular system.
pressure, resistance, flow
Q = ΔP/R, where Q is flow, P is pressure and R is resistance
In a vessel, if P1 is greater than P2, then a pressure differential will promote flow to the _____ end of the vessel.
P2
In a vessel, if R increases then the flow through the vessel will _____.
decrease
The single greatest determinant of flow through a blood vessel is _____.
diameter of the vessel
Q = r^4
Doubling the diameter of the vessel will cause a 16 fold _____ in blood flow.
reduction
moral of the story….small adjustments in vessel size = huge changes in blood distribution
Normal blood flow through a vessel is streamline and known as _____ flow.
laminar
When streamline blood flow is disturbed, _______ flow occurs.
turbulent
The noise made by turbulent blood flow is called ____ or _____.
bruit or murmur
What are the most common causes of turbulent flow in the vessels?
obstruction
high velocity flow (often caused by stenosis)
The point when turbulence happens is referred to as ______.
Reynolds number
Turbulence increases _____ forces on endothelial linings which causes damage to vessels.
shear
The tendency of intravascular pressure to stretch blood vessels in proportion to their ability to absorb blood is termed ______. How is it numerically defined?
compliance
C = ΔV/ΔP, where C is compliance, P is pressure and V is volume
The compliance of a blood vessel can also be understood as it’s ______.
distensibility
Which vessel is more compliant, arteries or veins?
veins are much more compliant/distensible
What is “delayed compliance” of blood vessels?
the capacity of vascular smooth muscle cells to relax if exposed to sustained stretching forces, causing vessel to enlarge when chronically overloaded with blood
