Hemodynamics

Question 1

Laminar flow

Answer 1

Layered flow
Center flows faster
Wall ends slower
Maximum amount of flow for a given P.
Parabolic

Question 2

Turbulent flow

Answer 2

Disarrayed squared velocity
Can be heard w/ stethoscope
More P required

Question 3

Korotkoff sounds

Answer 3

Produced by turbulent flow.
Made w/ cuff
Systolic highest
Diastolic stops

Question 4

Influence on turbulence

Answer 4

Increasing velocity

Question 5

Anomalous viscosity

Answer 5

Blood flow decreases as viscosity increases
Healthy people relatively constant
Person in shock more susceptible.
HEMATOCRIT…

Question 6

Tension of wall to radius & pressure (P)

Answer 6

Tension of wall is proportional to radius

If radius is increased so is the tension on the wall or chamber

Question 7

Laplace Law how capillaries hold high pressure w/o muscular walls

Answer 7

Very small radius

Question 8

Laplace and larger aneurysms

Answer 8

Larger the aneurysm the more tension the more probability of a rupture

Question 9

Distribution of blood in vessels

Answer 9

Venous circuit 75%
Arterial circuit 20%
Capillaries 5%

Question 10

Flow

Answer 10

Aorta - divisions capillaries same flow

Question 11

Flow velocity

Answer 11

Radius has effect
1 = 1
1/2 = 1/16
As surface area increases velocity decreases

Question 12

Total peripheral resistance

Answer 12

Inlet P
Outlet P
Cardiac P

Question 13

Pulmonary circuit resistance

Answer 13

Pressure of pulmonary artery
Left atrial pressure
CO

Question 14

Why is P lower in pulmonary circulation

Answer 14

B vessels much shorter
Poisseulles law
8nL/pir^4