Ever noticed how a tea bag spreads colour throughout a mug without you even stirring it? While Lottie used to think it was magic, Mr. H is here to explain the elegant biology behind Section 4.1.3.1: Diffusion.

In this episode, we unpack the fundamental way substances sneak into and out of our cells. We break down the exact physics-backed definition examiners look for, the three ultimate speed factors, and why being a massive multicellular human means you need specialized high-speed "diffusion stations" just to stay alive.

🎧 What You'll Learn in This Episode:

• The Passive Flow: What diffusion actually means, why it requires absolutely zero energy from the cell, and how it handles oxygen, CO2, and urea.
• The Three Speed Boosters: How temperature, surface area, and the steepness of the  ...