Methods of Transport

Here are some revision cards which outline methods of transport

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  • Created by: The WWC
  • Created on: 05-01-10 20:47

Diffusion

Through a Membrane, is passive due to the molecules already having kinetic energy and goes from a higher concentration to a lower concentration until an equilibrium is reached. Movement of particles is random.

Can: Oxygen, Carbon Dioxide

Cant: Glucose , Water

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Facilitated Diffusion

Through a membrane with the help of an intrinsic protein to help pass the molecules across the membrane that are water soluble. The movement of particles is still random. No energy is needed as the particles have the kinetic energy they need and it goes from a higher concentraion to a lower concentraion until an equilibrium is reached.

Can: Na+ ions , Water

Cant: Oxygen

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Osmosis

Movement of free flowing water through a partially permeable membrane. Goes from a higher concentation to a lower concentration and is passive due to the free flowing water molecule having kinetic energy. Stops when an equilibrium is reached.

Only Water - not the solutes in them

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Active Transport

The movement of molecules against the concentration gradient. This requires energy and this comes in the form of ATP. Doesnt depend on an equilibrium.

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Endocytosis

This method is used for the movement of bulk substances into a cell. Vesicles are created from the cell surface membrane, bringing contents into the cell.

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Exocytosis

This method is used for the movement of bulk substances out of a cell. Vesicles are created from the cell surface membrane, taking contents out of the cell.

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