Biology unit 3 Movement of molecules-Dissolved Substances B3.1.1

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Cells tissues and organs in plants and animals are adapted to take up and get rid of dissolved substances. Different conditions affect the rate of the transfer. Energy is sometimes needed.

Dissolved Substances

 a)Move by diffusion or active transport.

b)Water moves through a partially permeable membrane by osmosis from a more concentrate solution to a more dilute solution.

c)differences in concentrations cause osmosis.

d) Most soft drinks contain water, sugar, and ions.

e)The sugar in sports drinks is used to replace the sugar used in energy released during activity. The water and ions are used

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