A Level Biology Revision "Gas Exchange in Bony Fish"

You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/... In this video, we look at gas exchange in bony fish. First we explore the structure of the gills, including the gill arches, gill filaments and gill lamellae. We then look at how the structure of the gill lamellae are adapted for efficient diffusion of gases. We then explore how the gill lamellae use a counter-current exchange system to increase the rate of diffusion. Finally, we look at how bony fish maintain a constant water flow over their gills. 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: Tuna https://commons.wikimedia.org/wiki/Fi... Stephane-bdc, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons Salmon https://commons.wikimedia.org/wiki/Fi... Hans-Petter Fjeld, CC BY-SA 2.5 https://creativecommons.org/licenses/..., via Wikimedia Commons Cod https://commons.wikimedia.org/wiki/Fi... Hans-Petter Fjeld, CC BY-SA 2.5 https://creativecommons.org/licenses/..., via Wikimedia Commons Trout https://commons.wikimedia.org/wiki/Fi... Public domain Carp with missing operculum https://commons.wikimedia.org/wiki/Fi... Guitardude012, CC BY 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons Tuna gills https://commons.wikimedia.org/wiki/Fi... Chris 73 https://creativecommons.org/licenses/... Gill Arches https://commons.wikimedia.org/wiki/Fi... User:Uwe Gille, CC BY-SA 3.0 http://creativecommons.org/licenses/b..., via Wikimedia Commons