hemodynamics Flashcards
Capacitance vessels
veins - holds most of the blood
Total volume
5L
Flow equation
Q = dP/R
Unit Q
mL/min
Cardiac output (CO)
total flow in the CV system
Velocity
Q/A, highest in aorta
Poiseuille equation
Q = dP * pi * r^4/8 nl
flow is proportional to the __ th power of radius
4th
Rtot in parrallel is ____ than the resistance of any single vessel
lower
Parallel - changing a single vessel has ___ effect on system
little/low
Total resistance of capillary bed is ___ and is _____ of individual capillaries in parallel
low, independent
Rtot of a series of vessles is ___ than the resistance of any indivudal vessels
higher
Turbulent flow has ___ and ___
edies and vortices
Turbulent flow arrises in:
large diameter, high velocity, low viscosity, change in diameter, irregularity on walls
Turbulent flows produces ___ forces that ___ vascular endothelium
Shearing; Damage
flow is ___ in aorta
pulsatile
Flow is ___ in capillaries
continuous
Systolic pressure vs Diastolic pressure
peak/min aortic pressure
Pulse pressure eq =
Psys - Pdias
MAP = mean arterial pressure eq:
Pdias + 1/3 (Psys-Pdias)
arteriosclerosis define
vessels lose compliance (with age)
compliance (def/eq)
C = dV/dP
elastic property of vessels (absorb pulsatile flow to continuous)
aneurysm
weakened wall - buldges out (higher tension)
Laplace equation
T = dP r/mu (mu = wall thickness)
