Why Are Cells So Tiny? Surface Area to Volume Ratio Explained

Why can't you just have one giant cell? Join Bri to find out why cells stay tiny. Learn what surface area to volume ratio means, how to calculate it for a cube, why cells need a high ratio, and what affects how fast materials cross the cell membrane. In this video we covered What surface area, volume and SA:V ratio mean How to calculate SA:V for a cube, step by step Why the smaller the object, the higher the ratio Why cells stay small How villi and alveoli increase surface area The three factors that affect exchange across the cell membrane A practice calculation worked through Common mistakes that lose marks Quiz questions to test yourself CHAPTERS 0:00 Intro 0:11 Why not one giant cell? 0:31 Learning goals 0:49 What is SA:V? 1:15 Let's calculate 1:56 Why cells are small 2:28 Villi and alveoli 2:46 Factors affecting exchange 3:22 Practice question worked through 3:54 Common mistakes 4:24 Test yourself quiz 5:34 Recap Previous episode: The cell membrane and transport. Next episode: metabolism and cellular respiration. This video is a study aid. Always check with your teacher for anything specific to your school's course. If this helped, like and subscribe for more fun study videos! #HumanBiology #ATAR #SurfaceAreaToVolumeRatio #Cells #Biology