Learn: Diffusion and Osmosis

Welcome!Today we're going to learn about diffusion and osmosis. These processes are essential for how substances move in and out of cells. Let's dive in!

What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration. It happens naturally and does not require energy. This is important for moving substances like oxygen and carbon dioxide in our bodies.

Examples of DiffusionDiffusion occurs in the lungs where oxygen moves from the air in the alveoli into the blood, and carbon dioxide moves the opposite way.

What is Osmosis?Osmosis is the movement of water across a selectively permeable membrane, from a region of high water potential to a region of low water potential. It is a special type of diffusion and is crucial for maintaining cell functions.

Examples of OsmosisOsmosis occurs when water moves into plant roots from the soil. This process helps keep plants hydrated and supported.

Active TransportActive transport is the movement of substances against a concentration gradient (from low to high concentration). Unlike diffusion or osmosis, this process requires energy from the cell because it goes 'uphill'.

Investigating DiffusionDiffusion can be modelled using Visking tubing, which acts like a cell membrane. Scientists use it to see how substances move across a barrier with tiny pores.

Review Time!Great work! You've learned about diffusion, osmosis, and active transport. Now let's test your understanding with a few questions!

Well Done!You’ve completed the lesson on diffusion and osmosis. Keep practising to strengthen your understanding!