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Home Gallery Cell Biology and Microbiology
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Membrane Permeability
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Description
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




Gradients Across the Plasma Membrane

A concentration gradient is the difference in the concentration of a chemical between one side of the plasma membrane and the other

An electrical gradient is the difference in concentration of ions between one side of the plasma membrane and the other

Together, these gradients make up an electrochemical gradient

Transport Across the Plasma Membrane


Transport processes that move substances across the cell membrane are:

1. Passive processes
Simple diffusion
Facilitated diffusion
Osmosis

2. Active processes
Active transport
Vesicular transport



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