How Does Cell Size And Shape Influence The Diffusion Of Molecules Into And Out Of The Cell

Describe how increasing the size of a cell will affect the ability of diffusion to transport materials into and out of a cell.

Diffusion of substances into and out of a cell occurs across the cell surface.

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If the size of a cell increases it will be more difficult (all other things being equal) for diffusion to transport materials out of the cell.  The reason for this is because of the change in the surface to area ratio of the cell.

Diffusion must occur, as you...

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Transport of molecules across the membrane may be active or passive. Both active and passive transport involve selectivity. Some molecules cross the membrane more easily than others. A carrier molecule may also be involved in both systems.

The passage of molecules through the membrane from a high concentration to a low concentration region is called passive transport. Transfer of molecules takes place along the concentration gradient, and no energy is required.

In active transport molecules usually move from regions of low concentration, to regions of high concentration, i.e. against the concentration gradient. It requires energy.

 

 

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