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Multiple Choice

What type of movement occurs if CHP is greater than BCOP?

The key idea is Starling forces: capillary hydrostatic pressure pushes fluid out of the capillary, while capillary osmotic (colloid) pressure pulls fluid in. If CHP is greater than BCOP, the outward pushing force wins, creating a net filtration of fluid from the capillary into the interstitial space. So fluid is forced out of the capillary. (Interplay with interstitial pressures can modulate the amount, but the direction under this condition is outward filtration.)

The key idea is Starling forces: capillary hydrostatic pressure pushes fluid out of the capillary, while capillary osmotic (colloid) pressure pulls fluid in. If CHP is greater than BCOP, the outward pushing force wins, creating a net filtration of fluid from the capillary into the interstitial space. So fluid is forced out of the capillary. (Interplay with interstitial pressures can modulate the amount, but the direction under this condition is outward filtration.)