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(B) The plasma membrane is a selectively permeable barrier. Small,non-polar molecules and certain small polar molecules can pass through the lipid bil

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$8-10 \ \mathring A$

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(B) The plasma membrane is a selectively permeable barrier. Small,non-polar molecules and certain small polar molecules can pass through the lipid bilayer via simple diffusion. The pore size or the effective diameter of the channels/spaces through which these molecules can pass is generally considered to be in the range of $8-10 \ \mathring A$. Molecules larger than this typically require specific transport proteins or vesicular transport mechanisms to cross the membrane.

The size of molecules that can pass through the plasma membrane via simple diffusion is approximately:

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