Learn: Diffusion and Osmosis

Welcome!Today we'll explore diffusion and osmosis, two important processes for moving substances in and out of cells. You'll learn what they are, how they work, and why they're essential for life.

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. For example, oxygen diffuses into cells for respiration, and carbon dioxide diffuses out as a waste product.

What is Osmosis?Osmosis is the movement of water molecules across a selectively permeable membrane from an area of higher water potential to an area of lower water potential. It’s essential for cells to maintain the right balance of water.

Why Are Diffusion and Osmosis Important?Diffusion allows essential substances like oxygen and nutrients to enter cells and waste products to leave. Osmosis keeps cells hydrated and helps them maintain their shape, preventing them from shrinking or bursting.

Examples of Diffusion and OsmosisDiffusion occurs when oxygen moves into your blood from the alveoli in your lungs. Osmosis happens when water moves into plant roots from the soil.

Visking Tubing as a ModelVisking tubing is used to model diffusion and osmosis as it acts like a selectively permeable membrane. Small molecules like water can pass through, but large molecules like starch cannot.

Review Time!Great work! You've learned about diffusion, osmosis, and their importance. Let's review with some questions to check your understanding.

Final ThoughtsDiffusion and osmosis are vital processes that support life by moving substances in and out of cells. Think about how your body uses these processes every day!