Within a distinct segment along a capillary, the hydrostatic pressure is 35 mmHg, while the osmotic pressure is 25 mmHg. Considering these pressures, what is the likely direction of fluid movement?Group of answer choicesNo net movement.Net diffusion.Net filtration.Net absorption.
Question
Within a distinct segment along a capillary, the hydrostatic pressure is 35 mmHg, while the osmotic pressure is 25 mmHg. Considering these pressures, what is the likely direction of fluid movement?Group of answer choicesNo net movement.Net diffusion.Net filtration.Net absorption.
Solution
The direction of fluid movement in capillaries is determined by the balance between hydrostatic pressure and osmotic pressure.
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Hydrostatic pressure is the force exerted by the fluid on the walls of the capillary. In this case, it is 35 mmHg. This pressure tends to push fluid out of the capillary and into the surrounding tissues.
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Osmotic pressure is the pressure required to prevent the flow of water across a semipermeable membrane via osmosis. In this case, it is 25 mmHg. This pressure tends to pull fluid back into the capillary from the surrounding tissues.
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To determine the net movement of fluid, we subtract the osmotic pressure from the hydrostatic pressure. If the result is positive, fluid will tend to leave the capillary (net filtration). If the result is negative, fluid will tend to enter the capillary (net absorption).
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In this case, 35 mmHg (hydrostatic pressure) - 25 mmHg (osmotic pressure) = 10 mmHg.
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Since the result is positive, the likely direction of fluid movement is net filtration. Fluid will tend to leave the capillary and move into the surrounding tissues.
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