Uploaded April 2025 | Updated September 2026, 2 hours ago
In this video, we look at the organisation of the mammalian nervous system. We explore the central nervous system and the peripheral nervous system and then the somatic (voluntary) and autonomic nervous systems. Finally, we look at the functions of the sympathetic and parasympathetic nervous systems.
Image credits:
Peripheral and central nervous system
commons.wikimedia.org/wiki/File:Nervous_system_diagram_unlabeled.svg
Medium69, Jmarchn, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Sleeping dog
commons.wikimedia.org/wiki/File:Dog.in.sleep.jpg
Eugene0126jp, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Fight or flight response
commons.wikimedia.org/wiki/File:Dog_and_cat_showing_fight_or_flight_responses.jpg
Peretz Partensky from San Francisco, USA, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons
In this video, we look at the organisation of the mammalian nervous system. We explore the central nervous system and the peripheral nervous system and then the somatic (voluntary) and autonomic nervous systems. Finally, we look at the functions of the sympathetic and parasympathetic nervous systems.
Image credits:
Peripheral and central nervous system
commons.wikimedia.org/wiki/File:Nervous_system_diagram_unlabeled.svg
Medium69, Jmarchn, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Sleeping dog
commons.wikimedia.org/wiki/File:Dog.in.sleep.jpg
Eugene0126jp, CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Fight or flight response
commons.wikimedia.org/wiki/File:Dog_and_cat_showing_fight_or_flight_responses.jpg
Peretz Partensky from San Francisco, USA, CC BY-SA 2.0 creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons




![A Level Biology Revision (Year 13) Structure of the Liver
In this video, we look at the structure of the liver. First we explore the blood flow through the liver. We then look at liver cells, or hepatocytes. Finally, we explore how hepatocytes are arranged to form sinusoids, including the roles of Kuppfer cells and bile canaliculi.
Image credits:
Liver animation
https://commons.wikimedia.org/wiki/File:Liver_01_animation2.gif
Polygon data is generated by Database Center for Life Science(DBCLS)[2], CC BY-SA 2.1 JP https://creativecommons.org/licenses/by-sa/2.1/jp/deed.en, via Wikimedia Commons A Level Biology Revision (Year 13) Structure of the Liver](https://i.ytimg.com/vi/dbE8i93scyU/mqdefault.jpg)
![GCSE Chemistry Revision Paper Chromatography
Find your 9s with PLUS. Click the link to try for free https://www.freesciencelessons.co.uk/modules/gcse-chemistry-1-triple/
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In this video, we look at how we can use paper chromatography to separate the compounds in a mixture. First we explore how paper chromatography separates mixtures of soluble substances. I show you how to set up the apparatus for paper chromatography and what is meant by the stationary phase and the mobile phase. I then show you how we can tell from the results whether a substance is pure or a mixture of substances. I explain how paper chromatography works in terms of the attraction between a substance and the mobile phase. Finally, I explain why we draw the line on the chromatography paper in pencil and not pen.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. 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.
Image credit:
Coloured pens By RRRST (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons GCSE Chemistry Revision Paper Chromatography](https://i.ytimg.com/vi/dsKz9eF1Sc0/mqdefault.jpg)
![GCSE Biology Revision The Digestive System
Find your 9s with PLUS. Click the link to try for free https://www.freesciencelessons.co.uk/modules/gcse-biology-1-triple/
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In this video, we look at digestion and the digestive system. I take you through the basic ideas of why food needs to be digested and then we explore the different parts of the digestive system.
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.
Image credits:
Human digestive system Lozzaaa [Public domain], via Wikimedia Commons
Stomach
https://commons.wikimedia.org/wiki/File:Digestive_system Stomach_3 Smart-Servier.png
Laboratoires Servier, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Cheek cells
https://commons.wikimedia.org/wiki/File:Cheekcells_stained.jpg
Mulletsrokk, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons GCSE Biology Revision The Digestive System](https://i.ytimg.com/vi/e1RUivE3H1k/mqdefault.jpg)



