There are two main forces or pressures that contribute to bulk flow: hydrostatic

Question

There are two main forces or pressures that contribute to bulk flow: hydrostatic pressure and osmotic force. These act in both the capillary (forces/pressures from plasma) and in the interstitial fluid (IF). So, here are a total of four pressures or forces that contribute to bulk flow in capillaries - these are called he Starling forces, named after the physiologist who discovered them. Capillary hydrostatic pressure, P_C Interstitial fluid hydrostatic pressure, P_IF Capillary osmotic force, pi_C Interstitial osmotic force, pi_IF The tube below represents a blood capillary. Draw and label an arrow for each of the 4 factors listed above. The arrow should point in the direction that fluid will move as a result of that pressure/force. Indicate below how the magnitudes of the four Starling forces, P_C, P_IF, pi_C. and pi_IF, compare at the arterial and venous ends of the capillary. Fill in the blanks below with less than, greater than, or the same as a. Arterial end P_C Venous end P_C b. Arterial end P_IF Venous end P_IF c. Arterial end pi_C Venous end pi_C d. Arterial end pi_IF Venous end pi_IF See Fig. 12-14b for quantitative analysis.

Explanation / Answer

b. Arterial end PIF = Venous end PIF

c. Arterial end c = Venous end c

d. Arterial end IF = Venous end IF

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