Hemodynamic Properies of the Vasculature

Question 1

What is Q?

Answer 1

Volumetric flow

Question 2

What is v?

Answer 2

Velocity of flow

Question 3

What is the equation for velocity of flow?

Answer 3

v=Q/A

Question 4

What is the pressure that causes blood to flow?

Answer 4

Driving pressure (Upstream - downstream)

Question 5

How do you calculate Q?

Answer 5

Pup-Pdown/Radius

Question 6

What does distending pressure cause?

Answer 6

Blood vessels to open up and dilate

Question 7

What is total energy described as?

Answer 7

Pressure energy + Kinetic energy

Question 8

What happens to pressure energy as velocity increases?

Answer 8

Decreases

Question 9

What is coarctation?

Answer 9

Vessel narrowing

Question 10

What is critical closing pressure?

Answer 10

The pressure at which vessels collapse; increases with sympathetic stimulation

Question 11

Where is the greatest velocity of laminar flow found?

Answer 11

Axial in the center of the stream

Question 12

What is shear stress?

Answer 12

Force/area on laminae of flowing blood and vessel walls

Question 13

What is the relationship between resistance and radius?

Answer 13

R is inversely proportional to the radius to the fourth power

Question 14

Formula for calculating series resistance:

Answer 14

R=P/Q

Question 15

Formula for calculating parallel resistance:

Answer 15

1/R=Q/P

Question 16

What is anomalous viscosity?

Answer 16

As velocity increases the viscosity decreases

Question 17

What is Law of Laplace?

Answer 17

Wall tension= radius x Pressure (transmural)/ (vessel thickness)

Question 18

Transmural pressure equation?

Answer 18

Pressure inside- pressure outside