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Cell surface membrane is made up of largely fatty molecules. Question: How do charged ions eg sodium ions and large molecules eg glucose pass through the cell surface membrane?
Transport proteins help to transfer substances from one area of higher concentration to another area of lower concentration. Process is known as facilitated diffusion.
Figure 5 Diagram of how facilitated diffusion ccurs in cells.
Properties of transport proteins in facilitated diffusion
Able to transport substances in both directions depending on the side of cell surface membrane with a higher concentration of substances.
Transport proteins can only transport one substance (ie selective).
Transport proteins only speed up the physical process.
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