16: Hemodynamics

Question 1

Hemodynamics

Answer 1

Study of physical conditions governing flow through vasculatrue

Question 2

What part of vascular system has the most surface area

Answer 2

Capillaries

Question 3

Cardiovascular system properties

Answer 3

Non-homogenous fluid
branched non-rigid tubes
Propelled by pulsatile forces

Question 4

Flow

Answer 4

Proportional to pressure differences between 2 points

F=(p1-p2)/R

Question 5

Cardiac output

Answer 5

mean aortic pressure - mean right atrial pressure / total peripheral resistance

Question 6

TPR

Answer 6

proportional to viscosity

inversely proportional to radius of tube and number of tubes

Question 7

Factors that influence the properties of blood under pressure

Answer 7

Viscosity

Deformability

Question 8

Sickle cell anemia

Answer 8

Fibrinogen increases in RBC

Decreases Flexibility

Question 9

What does flow require

Answer 9

Pressure gradients

Question 10

Velocity

Answer 10

Distance fluid travels per unit time

inversely proportional to cross sectional area

Question 11

Laminar flow

Answer 11

In layers
Center is fastest
efficient
shear stress is proportional to rate of flow

Question 12

Turbulent flow

Answer 12

irregular motion
may be associated with murmurs
increases resistance to flow

Question 13

Turbulence equasion

Answer 13

= velocity x vessel diameter x density / viscosity

2000 is turbulent

Question 14

Kinetic energy of blood vessel

Answer 14

forward projecting

Question 15

Potential energy of blood vessel

Answer 15

Lateral projecting

Vessel walls expanding

Question 16

Bernoullis principle

Answer 16

Total energy at one area in a closed system must equal total energy in another area

Question 17

Effect of decreased lateral pressure during aortic stenosis

Answer 17

reduced coronary filling