hemodynamics Flashcards
in order for water to flow there must be a
Pressure gradient
if fluid in vessel is doubled what happens to flow
it doubles
Flow is
Velocity X Area
where is the lowest velocity of blood flow?
the capilaries
as area increases what happens to velocity?
It decreases
an increase in hematocrit(increase #rbcs) will have what effect on viscosity?
Increase in viscosity
Dehydration will cause …..
Hematocrit?
Viscosity?
Resistance?
Increase in hematocirt
increase in viscosity
increase in resistance
How does fluid move
in layers of laminae
What is resistance to flow caused by?
Friction between the laminae causes increase in resistance
Lowest velocity of blood flow in in capillaries explain?
total cross section area increases at capilaries which facilitates exchange of substances between blood and tissues.
FLow =
change in pressure / resistance
Longer the tube has what effect on resistance?
greater the resistance flow decreases
how does the radius of a tube effect resistance
the larger the radius the more blood flows through out the tube (4th power) ANY small change has a large effect on flow
if viscosity increases what happens to flow
flow decreases
