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(D) The cell membrane is selectively permeable,which means it allows the passage of certain molecules and ions while restricting others. One of its mo

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Ion regulation

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(D) The cell membrane is selectively permeable,which means it allows the passage of certain molecules and ions while restricting others. One of its most critical functions is the regulation of ions (such as $Na^+$,$K^+$,$Ca^{2+}$,and $Cl^-$) across the membrane to maintain the electrochemical gradient and cellular homeostasis. This is achieved through various transport mechanisms like ion channels,pumps,and carriers.

One of the fundamental characteristics of the cell membrane is:

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