A Level Biology Revision (Year 13) "The Pacinian Corpuscle" @Freesciencelessons

Uploaded January 2024 | Updated September 2026, 13 hours ago

In this video, we look at how the Pacinian corpuscle acts as a sensory receptor for pressure in the skin. We explore the role of stretch-mediated sodium ion channels and how these are responsible for the generator potential.

A Level Biology Revision (Year 13) The Pacinian Corpuscle

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$A Level Biology Revision Cell Fractionation You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/a-level-revision-videos/a-level-biology/ In this video, we look at how organelles are separated by cell fractionation. First we look at the roles of a homogeniser and buffer. We then look at the relative sizes of the different organelles. Finally, we explore how the organelles are fractionated by ultracentrifugation. Image credits: Pancreatic acinar cells https://commons.wikimedia.org/wiki/File:Pancreatic_acinar_cells TEM.jpg Louisa Howard, Public domain, via Wikimedia Commons Heart dissected Samuel Levy, CC BY 3.0 https://creativecommons.org/licenses/by/3.0, via Wikimedia Commons Homogeniser https://commons.wikimedia.org/wiki/File:Tissue_glass_teflon_Dounce_homogenizer-02.jpg Lilly_M, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons Centrifuge https://commons.wikimedia.org/wiki/File:Multipurpose_centrifuge.JPG Retama, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons$

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