Why is diffusion not always able to meet the ion or molecule needs of the cell?

Question:

Why is diffusion not always able to meet the ion or molecule needs of the cell?

Active Transport:

Active transport is a process that occurs across cell membranes and that uses energy that is provided by ATP molecules. Proteins which are embedded in the cell membrane create channels that can be used to move ions from areas of low concentration to areas of higher concentration when this is needed for optimum functioning of the cell.

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Diffusion is not always able to meet the ion or molecule needs of a cell because there are some molecules needed for cell metabolism that are not able...

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Why Is the Cell Membrane Selectively Permeable?

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Chapter 7 / Lesson 35
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Learn why the cell membrane is selectively permeable. Discover the composition of the plasma membrane and study examples of how the membrane facilitates transport.


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