Circulatory System Structure and Blood Flow Dynamics (3B)
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QUESTION
If total cross-sectional area increases
4
4
4
-fold, how does velocity change (constant
Q
Q
Q
)?
QUESTION
If a vessel radius doubles, by what factor does resistance change (Poiseuille)?
QUESTION
If blood viscosity doubles and all else is constant, how does flow
Q
Q
Q
change?
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ANSWER
Flow decreases by a factor of
2
2
2
. Flow is inversely proportional to viscosity in Poiseuille's law, with other factors constant.
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