Hemodynamics questions

Question 1

Match the type of flow with the description.
blood travels in well defined layers - velocities are uniform and predictable
or
blood flow is unstable and streamlines are broken into areas of circulating flow - multiple velocities current
or
blood flow is unpredictable - blood travels chaotically at all different velocities

Turbulent

Disturbed

Laminar flow

Answer 1

Laminar flow:
blood travels in well defined layers - velocities are uniform and predictable

Disturbed: blood flow is unstable and streamlines are broken into areas of circulating flow - multiple velocities current

Turbulent: blood flow is unpredictable - blood travels chaotically at all different velocities

Question 2

Disturbed flow is a type of laminar flow.

True or
False

Answer 2

False

Question 3

Blood flow is affected by which of the following:

The thickness of the vessel wall

The phase of the cardiac cycle

The size of the vessel

The type of vessel

Answer 3

Blood flow is affected by which of the following:

Incorrect answer:
The thickness of the vessel wall

Correct answer:
The phase of the cardiac cycle

Correct answer:
The size of the vessel

Correct answer:
The type of vessel

Question 4

Which of the following statements are true about velocity changes with stenosis?

A. At a stenosis causing complete occlusion the velocity will decrease

B. Velocity of blood increases through a narrowing/stenosis

C. A reduction of cross-sectional area of a vessel >65 is considered haemodynamically significant

D. The relationship between velocity and a reduction in cross-sectional area is linear

Answer 4

B. Velocity of blood increases through a narrowing/stenosis
A. At a stenosis causing complete occlusion the velocity will decrease

Question 5

The continuity equation is a method of calculating cross-sectional area. It is based on which law?

A. Poiseuille’s Law

B. Ohm’s law

C. The law of conservation of mass

D. Pascal’s Law

Answer 5

The law of conservation of mass

Question 6

The pressure gradient is greatest at the heart and decreases as blood moves more distally.

True or false?

Answer 6

True

Question 7

Eddy currents are found at the wall nearest to the origin of a bifurcation.

True

False

Answer 7

False

Question 8

The length and viscosity will have a greater effect on the resistance of a vessel in comparison to the radius of the vessel.

True

False

Answer 8

False

Question 9

The velocity profile at a curve will be:

A. skewing of the profile does not depend on the type of flow entering the curve

B. in a normal curved vessel the flow remains parabolic

C. skewed to the outer wall if the flow is blunted

D. skewed to the outer wall if the flow is parabolic

Answer 9

skewed to the outer wall if the flow is parabolic

Question 10

The law of fluid dynamics assume the following:

A. Blood vessels are pulsatile

B. Blood is heterogenous

C. Vessels are ridged tubes

D. Blood is a homogenous fluid

Answer 10

C. Vessels are ridged tubes

D. Blood is a homogenous fluid