1. Active transport
p.216

2. Requirements
Show me boards pens and rubbers

3. Objectives Students should learn:
that active transport is the absorption of substances against a concentration gradient
that energy from respiration is needed to carry out active transport
that active transport enables cells to take up ions from very dilute solutions
that sugars and ions can pass through cell membranes.

4. Outcomes Most students should be able to:
describe how active transport occurs
state examples of active transport in plants and animals
explain the importance of active transport to plants and animals.
Some students should also be able to:
explain in detail how active transport across a cell membrane takes place.

5. Specification
Substances are sometimes absorbed against a concentration gradient. This requires the use of energy from respiration. The process is called active transport. Active transport enables cells to absorb ions from very dilute solutions. [B3.1.1 g)]

6. Workbook
P.107

7. Active transport animation
Old nelson thornes disc b3 1.1 active transport simulation

8. Model Compare and contrast diffusion, osmosis and active transport
Describe the mechanism for active transport

9. Active transport
Q1 p.217
Diffusion, osmosis, concentration, against, transport, energy, respiration
AQA Science © Nelson Thornes Ltd 2006  9

10. 1 2 3
Draw and label from p. 216 4
How? 5 6

11. It takes energy for the active transport system to carry a molecule across the membrane and then return to its original position.
The energy comes from cellular respiration.
The rate of cellular respiration and the rate of active transport are closely linked.
What adaptation would cells doing lots of active transport have?
Cells involved usually have lots of mitochondria to provide the energy they need.
AQA Science © Nelson Thornes Ltd 2006  11

12. Uses of active transport
Plants
Animals

13. Uses of active transport
Plants
Moving ions into their roots
Animals
Cells lining the gut use active transport to move digested products in
Cells in the kidney take glucose back from filtered blood
Crocodiles move salt out into glands so they can live in the sea

14. Extension
Did you know p. 217
Cystic fibrosis

15. Label the graph: “Which line is which?”
Key
Uptake in roots + oxygen
Uptake by roots + Argon
ATP concentration in roots + Oxygen
ATP concentration in roots + Argon A B
Uptake of K+ ions by plant root (units)
ATP concentration in the cells C D
Time (mins)

16. Hungry hippos why is this like active transport?

17. White board activity answer D or O or AT
She could smell his aftershave from a few metres away.
Root hairs taking up water from the soil.
Oxygen moving between the alveoli and the bloodstream.
Glucose in the intestine moving into the blood in the villi down a concentration gradient.
Nitrate ions being taken into the root hair against a concentration gradient.
Glucose moving into the blood from a kidney tubule with a very low glucose concentration.
Water being lost from a cell as neighbouring cells lose water.