A-Level Biology - A-Level Biology - Diffusion - Simple & Facilitated | Factors Affecting Diffusion (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The definition of diffusion * The net movement of particles. * The concept of a concentration gradient. * Diffusion as a passive process. 2. The two main types of diffusion across cell membranes * Simple diffusion for small, non-polar molecules. * Facilitated diffusion for larger or polar molecules, involving channel and carrier proteins. 3. Key factors affecting the rate of diffusion * Temperature. * Concentration gradient. * Surface area of the membrane. * The number of available carrier or channel proteins. *** CHAPTERS *** 0:00 Introduction to Diffusion 0:23 What is Diffusion? (Definition and Concentration Gradient) 1:41 Types of Diffusion Across Cell Membranes 1:50 Simple Diffusion Explained 2:34 Facilitated Diffusion Explained (Channel & Carrier Proteins) 3:49 Factors Affecting the Rate of Diffusion *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://www.youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel