Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 5 - No. 9)
How does the cell membrane act to maintain cell homeostasis?
By allowing all substances to move in and out of the cell freely.
By acting as a selectively permeable barrier that regulates what enters and exits.
By only allowing water molecules to pass through.
By constantly expanding and contracting to adjust to the environment.
Explanation
The cell membrane is selectively permeable, controlling the passage of substances to maintain the internal environment.
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