Final answer:
Cell membranes regulate substance exchange to maintain cell balance by using transport proteins.
Explanation:
Cell membranes play a crucial role in maintaining equilibrium by controlling the exchange of substances in and out of the cell. They regulate the entry and exit of matter, ensuring a balance of salts, nutrients, and proteins to keep the cell functioning properly. The transport proteins present on the cell membrane act as channels or pumps to facilitate this exchange and protect the cell's internal environment.
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