GCSE Combined Science (AQA)

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Defining Active Transport

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Cell Biology Transport in Cells

Defining Active Transport

2:13 Active Transport
Spec 4.1.3.3
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  • Active transport moves substances from a more dilute solution to a more concentrated solution.
  • This movement is against the concentration gradient.
  • The process involves a cell membrane with an active transport pump.
  • Active transport requires energy to move molecules against or up their concentration gradient.
  • Differs from diffusion and osmosis, which follow the concentration gradient.
  • Active transport is essential for understanding in exams, differing from passive transport methods like diffusion and osmosis.
  • Energy required for active transport comes from respiration.
  • Examples of passive transport include diffusion and osmosis, which do not require energy.
  • Active transport is necessary when diffusion alone cannot meet a cell's needs.
  • Substances like glucose and ions move into cells against the concentration gradient through active transport.
  • Urea, a waste product, is removed from the blood into kidney cells via active transport, even against the concentration gradient.
  • In exams, explaining the movement of substances by active transport involves understanding the movement against the concentration gradient.

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