Transport in Cells
Biology: Cambridge International GCSE Supplement, topic 3.3.2
Transport in Cells
The three main forms of transport in cells are:
Diffusion
- Diffusion is the net movement of particles from an area of high concentration to an area of lower concentration.
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Osmosis
- Osmosis is a special case of diffusion where only water molecules move.
- It requires a partially permeable membrane.
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Active transport
- Active transport is the net movement of particles against a concentration gradient.
- Energy is therefore required.
Test yourself on Transport in Cells
Select the processes that are forms of passive transport?
Which of diffusion, osmosis and active transport are examples of passive transport?