Learn: Diffusion in Biology

Welcome!Today we'll learn about diffusion, a key process in biology. It's all about how substances move in and out of cells. Let's explore how it works step by step!

What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of lower concentration. This happens because particles spread out to fill the available space evenly. It's important for processes like oxygen moving into cells for respiration.

Factors Affecting DiffusionThe rate of diffusion depends on several factors:Concentration gradient: The bigger the difference in concentration, the faster diffusion happens.Temperature: Higher temperatures make particles move faster, speeding up diffusion.Surface area: A larger surface area allows more particles to move across at once.

Diffusion in Living OrganismsDiffusion occurs in many biological processes, such as:Gas exchange: Oxygen diffuses into cells for respiration, while carbon dioxide diffuses out.Nutrient absorption: Glucose and other nutrients diffuse into cells from the bloodstream.This process is vital for keeping cells alive and functioning.

How Diffusion Helps CellsDiffusion ensures cells get the substances they need and remove waste. For example:Oxygen for respiration diffuses into cells.Carbon dioxide, a waste product, diffuses out.Without diffusion, cells wouldn't survive!

Review Time!Great work! You've learned about diffusion, its factors, and how it helps cells. Let's test your understanding with a few questions.