Positive and Negative Feedback Loops

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/....
Boy, n.d. http://openclipart.org/detail/127915/....
Burger. Summer Pond on Dubenka River near Borovkovo, June 15, 2005. Own work. http://commons.wikimedia.org/wiki/Fil....
Carroll, Timothy J. Signs On Columns, March 5, 2007. http://www.flickr.com/photos/tjc/4119....
en.wikipedia, Original uploader was Prisonblues at. English: Mechanism of Glucose Dependent Insulin Release, August 16, 2004. Transferred from en.wikipedia; transferred to Commons by User:Leptictidium using CommonsHelper. http://commons.wikimedia.org/wiki/Fil....
File:Diabetes Signs symptoms17.jpg, n.d. http://wikieducator.org/File:Diabetes....
"File:Diabetes World Map - 2000.svg." Wikipedia, the Free Encyclopedia. Accessed November 14, 2013. http://en.wikipedia.org/wiki/File:Dia....
"File:Duodenumandpancreas.jpg." Wikipedia, the Free Encyclopedia. Accessed November 14, 2013. http://en.wikipedia.org/wiki/File:Duo....
"File:Ethylene-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed November 14, 2013. http://en.wikipedia.org/wiki/File:Eth....
"File:Paramecium.jpg." Wikipedia, the Free Encyclopedia. Accessed November 15, 2013. http://en.wikipedia.org/wiki/File:Par....
"File:Sphinx2 July 2006.jpg." Wikipedia, the Free Encyclopedia. Accessed November 14, 2013. http://en.wikipedia.org/wiki/File:Sph....
"File:Wiki Snake Eats Mouse.jpg." Wikipedia, the Free Encyclopedia. Accessed November 14, 2013. http://en.wikipedia.org/wiki/File:Wik....
Simple Tree, n.d. http://openclipart.org/detail/104527/....

Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: http://www.freesound.org/people/Cosmi...
Creative Commons Atribution License

• #education
• #homeostasis
• #feedback_loop
• #ap_biology
• #tutorial
• #negative_feedback
• #positive_feedback
• #thermoregulation
• #fruit_ripening
• #diabetes