Zusammenfassung der Ressource
Active Transport
- Allows cells to absorb substances
across partially permeable
membranes against the
concentration gradient.
- Cells may need to absorb
substances which are in short
supply, e.g. against the
concentration gradient.
- Requires the use of
energy released in
respiration
- Cells are able to absorb ions from dilute
solutions
- E.g. root cells absorb mineral ions from the
dilute solutions in the soil by active transport.
- Glucose can be reabsorbed in the kidney tubules by active transport.