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# 1 Simple diffusion is the direct passage of substances across the membrane in favor of their concentration gradient. In facilitated diffusion the movement of substances is also in favor of their concentration gradient but the substances move bound to specific molecules that act as “permeabilizers”, i.e., facilitators of their passage through the membrane.

Cell Membrane Review - Image Diversity: facilitated diffusion
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What is the energy source used in active transport through biological membranes?How does the intensity of simple diffusion vary in relation to the concentration gradient of the moved substance?
  1. Question Published at Thursday, 01 July 2010 in Category Cell Biology. Question Visited: 1071 Times.
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