018 - Positive and Negative Feedback Loops
Paul Andersen explains how feedback loops allow living organisms to maintain homeostasis. He uses thermoregulation in mammals to explain how a negative feedback loop functions. He uses fruit ripening to explain how a positive feedback loop functions. He also explains what can happen when a feedback look is altered. Diabetes mellitus is caused by an alteration in the blood glucose feedback loop.
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All of the images are licensed under creative commons and public domain licensing:
Apple, n.d.
http://openclipart.org/detail/137929/apple-by-jgm104.
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http://openclipart.org/detail/127915/boy-by-3dline.
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http://commons.wikimedia.org/wiki/File:Dubenka_pond.jpg.
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http://www.flickr.com/photos/tjc/411967882/.
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http://commons.wikimedia.org/wiki/File:Glucose-insulin-release.png.
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http://wikieducator.org/File:Diabetes_signs_symptoms17.jpg.
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http://en.wikipedia.org/wiki/File:Diabetes_world_map_-_2000.svg.
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http://en.wikipedia.org/wiki/File:Duodenumandpancreas.jpg.
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http://en.wikipedia.org/wiki/File:Ethylene-3D-vdW.png.
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http://en.wikipedia.org/wiki/File:Paramecium.jpg.
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http://en.wikipedia.org/wiki/File:Sphinx2_July_2006.jpg.
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http://en.wikipedia.org/wiki/File:Wiki_snake_eats_mouse.jpg.
Simple Tree, n.d.
http://openclipart.org/detail/104527/simple-tree-by-rg1024.
Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound:
http://www.freesound.org/people/CosmicD/sounds/72556/
Creative Commons Atribution License
