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Cardio Flow.pptx

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Cardio Flow.pptx

  1. 1. Flow in the Cardiovascular System • Flow (rate) vs. velocity of flow • Parameters of Resistance to Flow • Application
  2. 2. “The Arterial Tree”
  3. 3. Predict: As fluid moves through the branching (but closed) system of pipes, what happens to: Flow rate? Velocity of flow? The flow rate would remain constant from aorta to capillaries. Velocity is inversely proportional to tall cross- sectional area. Velocity of flow is lowest in the capillaries.
  4. 4. Formulas for Flow?? Flow is proportional to Delta P/R Flow=Velocity x Total Cross-sectional Area Delta P drives blood flow.
  5. 5. Fig 15-17 Velocity of flow is lowest in the capillaries!
  6. 6. Fig 15-5 What is the P in the cardiovascular system?
  7. 7. Resistance to fluid flow in a cylinder (Poiseuille’s Law): R = 8L/r4 Resistance to flow = the friction that opposes flow R  1/r4
  8. 8. Figure 14-1 Length relevant when comparing to
  9. 9. When is viscosity relevant in determining resistance? • change in • change in

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