Pressure and Blood Flow

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Pressure and Blood Flow

• Blood Flow
• Always from region of greater pressure to one of
  lower pressure
• Pressure exerted by blood is hydrostatic press.
• Rate is volume/time (L/min)
• Flow rate is directly proportional to difference
  in pressure.

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But there is more resistance

• Difference in pressure and resistance determine
  flow rate.
• Resistance is the measure of friction that
  impedes flow.
• F D P/R
• R is calculated from measured F and P

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Determinants of Resistance

• Viscosity
• Length of tube
• Radius of tube
• R (nL/r4) (8/p)
• nfluid viscosity
• Llength of tube
• rradius of tube
• 8/pkonstant

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