The Homeostasis Concept -What is meant by this term, examples of how mechanisms achieve homeostasis, negative and positive feedback.

Improvement suggestions: history of homeostasis? Further consideration of positive feedback, e.g. in pathological conditions. The Homeostasis Concept Homeostasis is a system of automatic control mechanisms which maintain the internal environment of an organism despite changes in the external environment (Campbell & Reece, 2005). The internal environment consists of extracellular fluids that bathe every cell of the body, supplying nutrients and receiving wastes (Purves et al., 2001). Regulators (animals which use homeostasis), maintain suitable physical conditions …

…lewis/homeo.htm 20/10/05 http://www.biology-online.org/4/1_physiological_homeostasis.htm 22/10/05 http://www.gonzaga.k12.nf.ca/academics/science/sci_page/biology/homeostasis_notes.htm 22/10/05 http://www.revision-notes.co.uk/revision/858.html 22/10/05 http://www-unix.oit.umass.edu/~psyc335c/lectures/lecture_5.htm 22/10/05 Via google: healthsciences.columbia.edu/dept/ ps/2007/firstyear/ns/2003/transcript_03_ns29.pdf 22/10/05 www.heim.ifi.uio.no/~mariul/inria/sorineVKI.pdf 22/10/05 www.uic.edu/depts/bioe/courses/ Fall05/BioE552/Vyas,R.%20-Appetite%20Control.doc 22/10/05