Learn: Diffusion and Osmosis

Welcome!Today we'll learn about diffusion and osmosis. These processes are key to understanding 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 until they are evenly spread out. This process happens in gases and liquids and does not require energy. For example, oxygen diffuses into cells during respiration.

What is Osmosis?Osmosis is the movement of water molecules across a partially permeable membrane, from an area of higher water concentration to an area of lower water concentration. It is a type of diffusion specific to water. For example, osmosis occurs in plant roots to absorb water from the soil.

Why Diffusion and Osmosis are ImportantThese processes are essential for cells to take in nutrients and remove waste. For example, oxygen diffuses into cells for respiration, and carbon dioxide diffuses out. Osmosis helps maintain the water balance in cells, which is vital for their function.

Factors Affecting DiffusionThe rate of diffusion can be affected by:Temperature: Higher temperatures make particles move faster, increasing diffusion rate.Concentration gradient: A steeper gradient speeds up diffusion.Surface area: A larger surface area increases the rate of diffusion.

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