In this video we look at the idea of surface area to volume ratio. First we explore how unicellular organisms can rely on diffusion through their cell membrane for transferring molecules in and out of the cell. We then look at what is meant by the surface area to volume ratio. I show you how to calculate the surface area to volume ratio and give you an example to try yourself. Finally, we look at how multicellular organisms have evolved to exchange substances.
This video is aimed at the UK A Level Biology specifications. Students studying International A Level Biology will need to check their specification.
Image Credits:
Amoeba
https://commons.wikimedia.org/wiki/File:Amoeba_proteus_another_form.jpg
SmallRex, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Flatworm
https://commons.wikimedia.org/wiki/File:Yellow_papillae_flatworm_(Thysanozoon_nigropapillosum)_(cropped).jpg
Betty Wills, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Cod
https://commons.wikimedia.org/wiki/File:Gadus_morhua-Cod-2-Atlanterhavsparken-Norway.JPG
Photo: Hans-Petter Fjeld, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5, via Wikimedia Commons
I would like to ask when you would be making video on survival and response and receptors like rods and cones it would be a great deal of help thank you your videos are amazing
@playgames6187 Says:
Thank you so much 👑
@George-Sanders Says:
the relationship between the metabolic rate and SA:V doesnt appear to have been covered in your videos. I don't understand how larger organisms apear to have higher metabolic rates due to size, however smaller organims are also said to have a high metabolic rate due to high SA:V ratio leading to rapid heat loss. So the relationship between size and metabolic rate is unclear. Any clarification would be much apreciated.
@Nanananananalaflor Says:
hi sir thank u so much for these videos, I was wondering if you could do module 6 on gene sequencing before this years exams please? thank you again!
@shakira__lyrics1 Says:
I love you
@HelenaFrans-j7d Says:
can you help
@HelenaFrans-j7d Says:
hey sir! i have exams on monday,,,i need help on these topic
@NicoleSegobo Says:
can somome tell me why its 3:1??? im not good with math so idk where the one came from
@V1NESVR Says:
W helping with mocks 🙏👍😎
@Charlotte-hf5jz Says:
Love your videos! Please could you make a video on A-Level differentiation and classification and biodiversity? I noticed you started classification so thank you for that :)
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