Define filtration in the context of capillary exchange.

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Multiple Choice

Define filtration in the context of capillary exchange.

Filtration in capillary exchange is the pressure-driven bulk movement of water and small solutes from the capillary blood through the endothelial pores into the surrounding interstitial space. The capillary wall acts as a porous membrane, and hydrostatic pressure pushes the solution through these pores, carrying solutes with it. This is why the option describing the removal of solutes as a solution passes through a porous membrane best matches the concept. In contrast, diffusion moves solutes down their concentration gradient without the same bulk, solvent-driven flow, and active transport uses energy to move substances against gradients.

Filtration in capillary exchange is the pressure-driven bulk movement of water and small solutes from the capillary blood through the endothelial pores into the surrounding interstitial space. The capillary wall acts as a porous membrane, and hydrostatic pressure pushes the solution through these pores, carrying solutes with it. This is why the option describing the removal of solutes as a solution passes through a porous membrane best matches the concept. In contrast, diffusion moves solutes down their concentration gradient without the same bulk, solvent-driven flow, and active transport uses energy to move substances against gradients.

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