Uploaded September 2023 | Updated September 2026, 21 hours ago
You can find all my A Level Biology videos fully indexed at freesciencelessons.co.uk/a-level-revision-videos/a-level-biology
In this video, we look at anaerobic respiration. First we explore why a lack of oxygen prevents the production of ATP. We then look at how this is partially solved by anaerobic respiration in mammals (producing lactic acid or lactate) and in plants and yeast (producing ethanol).
You can find all my A Level Biology videos fully indexed at freesciencelessons.co.uk/a-level-revision-videos/a-level-biology
In this video, we look at anaerobic respiration. First we explore why a lack of oxygen prevents the production of ATP. We then look at how this is partially solved by anaerobic respiration in mammals (producing lactic acid or lactate) and in plants and yeast (producing ethanol).










![GCSE Biology Revision Digestive Enzymes
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In this video, we look at the specific enzymes found in the digestive system. We start by looking at the lock and key theory which explains why enzymes are specific. We then look at each of the three enzymes in digestion.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Biology. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/?keywords=deliberate+thought
Artist: http://incompetech.com/
Image credits:
Human digestive system Lozzaaa [Public domain], via Wikimedia Commons GCSE Biology Revision Digestive Enzymes](https://i.ytimg.com/vi/ypHpbHfDJsA/mqdefault.jpg)