Ch 18: Hemodynamics Flashcards
This indicates the volume of blood moving during a particular time.
flow (aka volume flow rate)
Flow is measured in units of…
volume divided by time (L/min)
This indicates the speed of a fluid moving from one location to another.
velocity
Velocity is measured in units of…
distance divided by time (cm/s)
Three basic forms of flow…
- pulsatile
- phasic
- steady
This kind of flow occurs when blood moves with a variable velocity as a result of cardiac contraction.
pulsatile flow
This kind of flow commonly appears in the arterial circulation.
pulsatile flow
This kind of flow occurs when a fluid moves with a variable velocity as a result of respiration.
phasic
This kind of flow commonly appears in the venous circulation.
phasic
This kind of flow occurs when a fluid moves at a constant speed.
steady
This kind of flow is present in the venous circulation when individuals stop breathing for a moment.
steady
This is when the flow streamlines are aligned and parallel.
laminar flow
The word lamina means…
layer
Laminar flow patterns are commonly found in __ physiologic states.
normal
This flow occurs when all of the layers and blood cells travel at the same velocity.
plug flow
This flow has a bullet-shaped profile with the highest velocity in the center of the lumen.
parabolic flow
T/F? Laminar flow is silent flow.
true
This predicts whether flow is laminar or turbulent.
Reynold’s number
The Reynolds number for laminar flow is…
less than 1500.
This flow is characterized by chaotic patterns in many different directions and at many speeds.
turbulent
This is a small swirling rotational pattern appearing in turbulent flow.
eddy current or vortex
T/F? Turbulent flow is often normal.
FALSE, pathologic
This is tissue vibration associated with turbulence, a palpable murmur.
thrill
The Reynolds number for turbulent flow is…
greater than 2000.
Blood moves from regions of higher energy to lower energy. This is called…
energy gradient
Three forms of energy associated with blood…
- kinetic
- pressure
- gravitational
The energy associates with a moving object is…
kinetic
Kinetic energy is determined by two factors…
- an object’s mass
2. the speed at which it moves
The energy associated with stored or potential energy is…
pressure
This energy is associated with any elevated object.
gravity