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3.3) Active transport

3.3) Active transport

 

Active transport: is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using the energy from respiration.

 

Examples of active transport include:

  • uptake of glucose by epithelial cells in the villi of the small intestine (and by kidney tubules)
  • uptake of ions from soil water by root hair cells in plants

Carrier proteins pick up specific molecules and take them through the cell membrane against the concentration gradient.

 

  • Substance combines with carrier protein molecule

 

  • Carrier transports substances across membrane using energy from respiration
  • Substance released into cell

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