Water movement across the digestive mucosa occurs via which passive mechanism?

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Multiple Choice

Water movement across the digestive mucosa occurs via which passive mechanism?

Water moves across the digestive mucosa by osmosis. This is a passive process driven by differences in solute concentration: as solutes are absorbed from the lumen, the side of the epithelium near the lumen becomes relatively more concentrated, pulling water through the mucosal barrier toward the area of higher solute concentration. This movement doesn't require cellular energy and often happens through aquaporin channels or paracellular pathways. Filtration relies on hydrostatic pressure differences, which isn’t the primary mechanism here. Active transport would require energy to move solutes, and diffusion of water alone isn’t the standard way we describe water movement across the mucosa in this context (osmosis specifically accounts for water movement in response to solute gradients).

Water moves across the digestive mucosa by osmosis. This is a passive process driven by differences in solute concentration: as solutes are absorbed from the lumen, the side of the epithelium near the lumen becomes relatively more concentrated, pulling water through the mucosal barrier toward the area of higher solute concentration. This movement doesn't require cellular energy and often happens through aquaporin channels or paracellular pathways.

Filtration relies on hydrostatic pressure differences, which isn’t the primary mechanism here. Active transport would require energy to move solutes, and diffusion of water alone isn’t the standard way we describe water movement across the mucosa in this context (osmosis specifically accounts for water movement in response to solute gradients).

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