The cell membrane around a cell forms a barrier that protects and regulates the cell. Certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane. Which best describes those that can pass through?

The plasma membrane is made mostly of lipids, so substances that dissolve in lipids can pass through it more easily. “Soluble” best describes chemicals that can dissolve in the membrane; being concentrated, diluted, or heated does not by itself make a substance able to cross it.

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