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During the course of this essay I shall discuss and describe some of the different transport processes which occur across cell membranes. I will concentrate on these specific types of transport mechanisms, these are, passive transport (simple diffusion, facilitated diffusion, osmosis) and active transport. Once I have achieved this I shall finally examine bulk transport methods.
There are two ways that the molecules move through the membrane: passive transport and active transport. Active transport requires that the cell use energy that it has obtained from food to move the molecules (or larger particles) through the cell membrane. Passive transport does not require such energy expenditure, and occurs spontaneously.
The principle means of passive transport is diffusion. ... This limits the maximum possible concentration of the molecule inside the cell. ... Therefore, though diffusion is an effective enough transport mechanism for some substances (such as H2O), the cell must utilize other mechanisms for many of its transport needs.
Approximate Word count = 737
Approximate Pages = 2.9
(250 words per page double spaced)
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