What happens when molecules diffuse across the cell membrane?

Explanation:

Facilitated diffusion. ... In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers. A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.

The plasma membrane is selectively permeable; hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot. Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.

Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. ... it is the random motion of the molecules that causes them to move from an area of high concentration to an area with a lower concentration.

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