Simple Diffusion - gases and nonpolar compounds transport

Gases and some molecules can diffuse through the phospholipid bilayer because they are small or non-polar. Oxygen gas. Carbon dioxide gas. Lipid based hormones. Plasma membranes are selectively permeable: The lipid bilayer is always permeable to small, nonpolar, uncharged molecules Transmembrane proteins that act as channels or transporters increase the permeability of the membrane Macromolecules are only able to pass through the plasma membrane by vesicular transport

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