Hemodynamics – Dynamics of Blood Circulation
A)
General Hemodynamics
B)
Special Hemodynamics
A)
General – biophysical considerations:
Parameters:
1) Flow
2) Velocity
3) Pressure
4) Resistance
1) Blood Flow
V
F = –––– (m
3
/s; 1/s; ml/min ...)
t
Flow: – luminar (streamline)
-
turbulent
dens.x diam. x velocity
Reynolds number = –––––––––––––––––––
Viscosity
Critical velocity – in ascending aorta
- in anemia
Systolic murmurs
Dif.P
F = ––––––
R
Critical closing pressure = P at which flow ceases.
Velocity of Blood
1
v = –– (m/s; cm/s ...)
t
F
= flow cm
3
x s
-1
v = –––
= ---------- = cm/s
A
= cross–sectional area cm
2