Homeostasis 2007-2008.

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Presentation transcript:

Homeostasis 2007-2008

http://www.bozemanscience.com/positive-and-negative-feedback-loops

Maintaining homeostasis hormone 1 gland lowers body condition high specific body condition low raises body condition gland Negative Feedback Model hormone 2

Controlling Body Temperature Nervous System Control Feedback Controlling Body Temperature nerve signals hypothalamus sweat dilates surface blood vessels high body temperature (37°C) low hypothalamus constricts surface blood vessels shiver nerve signals

Regulation of Blood Sugar Endocrine System Control Feedback Regulation of Blood Sugar islets of Langerhans beta islet cells insulin body cells take up sugar from blood liver stores glycogen reduces appetite pancreas liver high blood sugar level (90mg/100ml) low liver releases glucose triggers hunger pancreas liver islets of Langerhans alpha islet cells glucagon

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