Physics Quiz 2 — Hemodynamics Flashcards
What is flow characterized by multiple velocities and cross currents called?
Turbulent flow
What are the hemodynamics of blood flow ?
Blood flows from high pressure to low pressure
What will be the result of exceeding Reynolds’s number?
Turbulence
What is the term that is used to characterize a fluids ability to resist a change in flow?
Viscosity
Flow Volume will increase if
the radius is increased
What is the result of vasoconstriction over a large area?
Flow volume decreases
_______________ are the tiniest vessels in the human body
Capillaries
What refers to the forces and motion of blood flow?
Hemodynamics
Inspiration ________ intrathoracic pressure and ________ intraabdominal pressure
Decreases; Increases
T/F
If the length of the tube increases, the flow volume will also increase
False
T/F
Poiseuilles law deals with a straight vessel without stenosis
True
T/F
Body orientation and respiration do not affect hemodynamics
False
If there is a tight stenosis seen at the right carotid bulb where would you most likely see turbulent flow?
Proximal right ICA
If there is a stenosis in at the right carotid bulb where will you have the highest potential energy?
Distal right CCA
According to Poiseuilles equation, a small change in which factor has the greatest influence on volume flow rate?
Radius
T/F
A patient with polycythemia will have a decreased blood viscosity
False
____________ ______________ shows the inverse relationship between pressure and velocity
Bernoulli’s principle
In this type of flow the average speed is equal to one half the maximum speed.
parabolic
Hydrostatic pressure is related to the weight of blood pressing on a vessel. What does it use as a reference point?
Right atrium
The patients cardiac output is approximately _____________ if heir heart rate is 72 bpm, end diastolic volume is 135 ml, and their end systolic volume is 54 ml.
5.8 liters/min
A patient in the upright position has an arterial blood pressure of 110 mmHg. What would the pressure be at the knee?
185 mmHg
What would the pressure be at the patients head when they have an arterial blood pressure of 130 mmHg and are in the supine position?
130 mmHg
T/F
When a vein has a dumbbell appearance the pressure and the volume of blood is low.
True
T/F
Capacitance is the rate at which the volume increases with respect to the change in pressure
False
(This would be compliance)
This is the property of blood flow that causes blood to resist a change in speed or direction.
Inertia
T/F
Flow volume and flow velocity represent the same parameter
False
***Written
Describe three things that help venous flow return to the heart
- Venous Valves prevent backflow of blood and ensure that the blood moves in the right direction towards the heart.
- Calf muscles act as a pump and compress the veins, helping push blood up towards the heart.
- The pressure difference between the veins and the heart helps drive the blood back toward the heart because the veins have a higher pressure compared to the heart which is an area of lower pressure.
***Written
The pre-prandial SMA should exhibit what kind of waveform?
High-resistance
At which percent stenosis would there be a decrease in flow volume?
80%
***Written
Reynolds number is a numerical value over __________
2000
T/F
Transmural pressure is the amount of pressure that is being exerted on the vein from outside forces
False
