EXPEDITION 3 / 8 · COLLEGE BOARD UNIT 2

Cells

Membranes, transport, and compartmentalization

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EXPLORE & EXPERIMENT

Which way will water move?

Compare solute water potential inside and outside a cell. The marker follows the internal concentration.

Internal − external water potential (bar)

Initial net water movement: into the cell

Model & assumptions

Ψ = Ψs + Ψp; Ψs = −iCRT

Equal pressure potential (zero), 298 K, i = 1, nonpenetrating solute, and a water-permeable membrane. This shows initial direction, not final cell volume.

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