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Question

The net movement of water into or out of the cell is driven by differences in ___ between the extracellular fluid and the intracellular fluid.


A

Diffusion gradient

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B

Diffusion pressure

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C

Osmotic pressure

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D

Tonicity

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Solution

The correct option is C

Osmotic pressure


Osmotic pressures

Osmotic pressure is a measurement of how strongly a solution will draw water into itself from an adjacent solution across a semi-permeable membrane.

Living cells have the potential of gaining or losing water from the surrounding extracellular fluid through osmosis. It is the difference in the solute concentration across a semi-permeable membrane that provides the driving force for osmosis. The overall water movement is possible only if the semi-permeable membrane is ready to accommodate this change in volume. As more water is drawn into the more concentrated solution, there's a build up in pressure leading to cessation (stopping) of osmosis.


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