Hemodynamics

Question 1

CO=

Answer 1

P left ventricle/TPR

MAP/TPR

Question 2

Reynolds number (Re)

Answer 2

Re= 2rvp/viscosity

Question 3

Re> 3000

Answer 3

Turbulent flow

• causes significant losses of kinetic energy
• less flow when flow is turbulent

Question 4

Re< 2000

Answer 4

Laminar flow

-silent flow

Question 5

Static pressure

Answer 5

Present whether the blood is moving or not

-composed of the applied or lateral pressure and force of gravity

Question 6

Dynamic pressure

Answer 6

due to kinetic energy

Question 7

As velocity decreases

Answer 7

Dynamic pressure becomes a smaller fraction of the total pressure

Question 8

As vessel radius narrows

Answer 8

the dynamic component increases significantly

Question 9

Sheer stress on the vessel wall is proportional to

Answer 9

Viscosity
sheer rate
-rate at which the axial velocity changes from the wall to the lumen
-sheer force greatest at the vessel wall and goes down toward the lumen

Question 10

Sheer stress on the vessel wall is inversely proportional to

Answer 10

Cube of the vessel radius
- smaller the vessel the more sheer stress on the vessel
-decrease size increase stress
Maximal velocity

Question 11

Increase in blood velocity

Answer 11

greater proportion of blood pressure is converted from lateral into dynamic pressure
Thus— lateral pressure decreases while dynamic pressure increases