Diffusion and Gas Exchange
Think of diffusion as nature's way of spreading things out evenly - just like how your perfume fills a room without you doing anything! Diffusion happens when particles move from areas where there's loads of them (high concentration) to areas where there aren't many (low concentration).
This process works faster when it's warmer because particles have more energy to zoom about. The bigger the difference in concentration between two areas, the quicker diffusion happens.
Your body has some brilliant adaptations for gas exchange. Alveoli in your lungs have thin walls and a massive surface area, whilst villi in your intestines are covered in millions of tiny projections. Fish gills work similarly, with blood flowing in the opposite direction to water for maximum efficiency.
Quick Tip: Remember that all gas exchange surfaces share three key features - they're thin, have a large surface area, and maintain good blood supply!
