Arterial Physiology & Fluid Dynamics Flashcards
the arterial system pumps about ___ml of blood into the aorta with every heart beat
70ml
what is stroke volume?
amount of blood ejected during heart beat
blood moves from regions of ___ to ___ energy
high to low energy
energies associated with blood (3)
kinetic
pressure
gravitational
kinetic energy formula
pressure/potential energy formula
what happens during inspiration? (3)
diaphragm moves down towards abdomen
↑ abdominal pressure ↓ thoracic pressure
↑ blood flow to heart ↓ blood flow to legs
what happens during expiration? (3)
diaphragm moves upward into thorax
↓ abdominal pressure ↑ thoracic pressure
↓ blood flow to heart ↑ blood flow to legs
___ flow is affected by cardiac contraction
pulsatile flow
___ flow is affected by respiration
phasic
2 types of laminar flow
plug
parabolic
___ flow = blood travels at the same velocity
plug
___ flow = highest velocity is in the center of the vessel
parabolic flow
____ indicates whether flow is laminar or turbulent
Reynolds Number
Re < 1500
laminar flow
Re > 2000
turbulent flow
↑viscosity ↓____
↑viscosity ↓velocity
Poiseuille’s Law equation
↑ diameter ↓ ____ & ____
↑ diameter ↓ resistance & velocity
Bernoulli’s Principal
velocity and pressure are inversely related
Ohm’s Law
movement of fluid through a tube and movement of electricity through a wire are similar
pressure gradient = flow x resistance
voltage = current x resistance
____ Doppler waveform is usually seen proximal to stenosis
monophasic Doppler waveform
left ventricular and/or aortic valve abnormalities alter ____
arterial hemodynamics
unilateral flow alterations suggest (2)
vessel disease
extrinsic compression
bilateral flow alterations suggest
cardiac involvement
