Learn: Diffusion and Osmosis

Welcome!Today we'll explore diffusion and osmosis, two key processes that help substances move across cell membranes. These concepts are essential for understanding how cells function.

What is Diffusion?Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. It is a passive process, meaning it does not require energy. Diffusion is vital for transporting oxygen and carbon dioxide in and out of cells.

What is Osmosis?Osmosis is the diffusion of water through a selectively permeable membrane. Water moves from an area of higher water potential (less solute) to lower water potential (more solute). This process is crucial for maintaining cell stability and hydration.

How Cell Membranes Are InvolvedCell membranes are selectively permeable, meaning they allow certain substances to pass through while blocking others. For example, small molecules like oxygen and water can pass freely, but larger molecules like proteins cannot.

Real-World Example: Diffusion in the BodyOxygen diffuses from the alveoli in the lungs into the blood, while carbon dioxide diffuses the opposite way. This allows for gas exchange during respiration.

Real-World Example: Osmosis in PlantsWater moves into plant root cells via osmosis, allowing plants to absorb water and nutrients from the soil. This process supports photosynthesis and structural stability.

Review Time!Great work! You've learned about diffusion, osmosis, and how these processes are crucial for cell function. Now let's review with a few final questions.

Well Done!You've completed the lesson on diffusion and osmosis. Keep practising to strengthen your understanding of these important biological processes!