Learn: Diffusion in Biology

Welcome!Today we'll learn about diffusion, an important process in biology. Let's explore how substances move across membranes step by step.

What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration. It happens because particles are constantly moving and spreading out. Diffusion is important for processes like gas exchange in cells.

How Diffusion WorksDiffusion relies on the concentration gradient, which is the difference in concentration between two areas. Particles move down the gradient, meaning they travel from where they are more concentrated to where they are less concentrated. This process does not need energy.

Factors Affecting DiffusionThe rate of diffusion depends on several factors:Temperature: Higher temperatures make particles move faster, increasing diffusion rate.Concentration Gradient: A steeper gradient leads to faster diffusion.Surface Area: A larger surface area allows more particles to pass through.

Diffusion in CellsDiffusion happens through the cell membrane, allowing essential substances like oxygen and carbon dioxide to enter or leave the cell. The cell membrane is partially permeable, meaning only certain substances can diffuse through it.

Real-World ExampleDiffusion is essential for breathing. Oxygen from the air diffuses into your blood in the lungs, while carbon dioxide diffuses out of your blood into the air. This keeps your body supplied with oxygen and removes waste gases.

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

Well Done!You’ve completed the lesson on diffusion. Remember, it's vital for processes like breathing and helps maintain life in cells.