permeability of membranes

a theoretical concept of the permeability of a cell membrane, in which the membrane structure is thought to contain pores through which solutes can sometimes pass down a CONCENTRATION GRADIENT by DIFFUSION (see FLUID-MOSAIC MODEL). Many membranes are, however, differentially permeable to certain molecules. For example, SELECTIVE PERMEABILITY enables OSMOSIS to take place. Others will allow movement against a concentration gradient by ACTIVE TRANSPORT. An example is the removal of sodium by cells surrounded by a higher sodium concentration.

单词	permeability of membranes
释义	permeability of membranes permeability of membranes a theoretical concept of the permeability of a cell membrane, in which the membrane structure is thought to contain pores through which solutes can sometimes pass down a CONCENTRATION GRADIENT by DIFFUSION (see FLUID-MOSAIC MODEL). Many membranes are, however, differentially permeable to certain molecules. For example, SELECTIVE PERMEABILITY enables OSMOSIS to take place. Others will allow movement against a concentration gradient by ACTIVE TRANSPORT. An example is the removal of sodium by cells surrounded by a higher sodium concentration.
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