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List the factors that determine the rate at which specific molecules diffuse across the...

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liln8ve | Student, Undergraduate | Honors

Posted January 23, 2009 at 5:21 AM via web

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List the factors that determine the rate at which specific molecules diffuse across the cell membrane.

Biology 12

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giorgiana1976 | College Teacher | Valedictorian

Posted January 26, 2009 at 6:04 PM (Answer #1)

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There are 4 factors which determine the rate of diffusion:

  1. The stepness of the concentration gradient (the bigger the difference between two sides of membrane, the quicker the rate of diffusion);
  2. Temperature (higher temperatures give molecules more kinetic energy, molecules moving around faster, so diffusion is faster);
  3. The surface area ( more molecules can cross a greater area of membrane, any time);
  4. The type of molecule diffusing (large molecules need more energy to move, so they move slowly; non-polar molecules diffuse mor easily than polar molecules).

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