GCSE Biology - Surface Area to Volume Ratio

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*** WHAT'S COVERED ***
1. The concept of surface area to volume ratio.
2. The importance of SA:V ratio for the exchange of substances via diffusion in organisms.
* How single-celled organisms exchange substances.
* Why large multicellular organisms need specialised systems.
3. How surface area and volume change as an organism gets larger.
4. Calculating surface area, volume, and the SA:V ratio using cube examples.
5. Why larger organisms cannot rely solely on diffusion across their outer surface.
* The need for specialised exchange surfaces.
* The need for transport systems.

*** CHAPTERS ***
0:00 Intro to Surface Area to Volume Ratio
0:11 Why SA:V Ratio Matters for Organisms
0:43 Needs of a Single-Celled Organism
1:15 Surface Area vs Volume Explained
1:52 Calculating Surface Area to Volume Ratio
2:11 Calculating Surface Area of a Cube
2:42 Calculating Volume of a Cube
2:59 Calculating the SA:V Ratio (Examples)
3:45 Comparing SA:V Ratios
4:20 Applying SA:V Ratio to Bacteria & Humans
4:49 Specialised Exchange Surfaces & Transport Systems
5:24 Diffusion Distances and Size
6:36 Summary: Why Larger Organisms Need Specialised Systems

*** PLAYLISTS ***










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