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Regulation of Transport
The basic rule that cells must follow to control the movement of substances across cellular boundaries.
Selectively Permeable
The property of plasma membranes that allows them to regulate the flow of molecules in and out of the cell.
Hydrophobic Molecules
Molecules that can easily dissolve in the lipid bi-layer of the membrane and cross it without difficulty.
Hydrophilic Molecules
Polar molecules, such as sugars, that do not easily cross the membrane.
Transport Proteins
Proteins that enable the passage of hydrophilic substances across the membrane.
Channel Proteins
Transport proteins with a hydrophilic channel that acts as a tunnel for specific molecules to pass through.
Aquaporins
Channel proteins specifically designed to facilitate the passage of water molecules.
Shape Change
The ability of transport proteins to bind to molecules and alter their shape in order to transport them across the membrane.
Note
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