Starter

Complete the following:

Diffusion is the movement of particles …….…… a ……………….. gradient from an area of .……. concentration to an area of …………… .

Extension:How does osmosis differ to diffusion?

Active Transport

Lesson Objectives

1. Define and explain the process of active transport

2. Recall examples of cells making use of active transport

Diffusion and Osmosis

Diffusion and osmosis are both processes that require no energy.

This is because they allow molecules to move down a concentration gradient (like a ball rolling down a hill).

Active Transport

Sometimes it’s necessary for substances to travel AGAINST the concentration gradient (from low to high concentrations)

This requires ENERGY from respiration

This is called Active Transport

Active Transport

Sometimes it’s necessary for substances to travel AGAINST the concentration gradient (from low to high concentrations)

This requires ENERGY from respiration

This is called Active Transport

Diffusion and Osmosis

Which way will the particles move?

Active Transport

The particles move up the concentration gradient using energy from respiration.

ENERGY

This is active transport

Active Transport • Active transport occurs across a

partially permeable membrane

• Carrier proteins within the membrane allow this movement to occur

Outside

Inside of cell Outside of cell

ATP

PADP

Active Transport

Active Transport • This occurs in both animal and plant

cells• Plant cells: root hair cells take in

nitrates from the soil even though the concentration within the cell is higher than that in the soil

• Animal cells: glucose being reabsorbed by the kidneys from the kidney tubules

Active Transport

• Complete the active transport worksheet to consolidate your learning

• Stick into your books once finished