January 5th - J anuary 5t h Homeostasis is never about...

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January 5 th Homeostasis is never about maintaining an exact balance but within a limit Negative Feedback Stimulus (deviation from normal)-sensor (monitors conditions)- integrator (compares conditions to normal values)- Effector (compensates for deviation)-response (move system back to normal) o Hormones Secreted by endocrine gland or neurosecretory (brain) cell and affect non-adjacent (distant) cells Steroid hormones Non-steroid (peptide-water soluble) hormones Endocrine: ductless glands that secrete hormones Pancreas: islet cells secrete insulin (if sugar is high) and glucagon (if sugar is low), secreted into blood Insulin causes cells in liver to convert sugar into glycogen Glucagon causes cells in liver to convert glycogen to sugar Exocrine: has duct, secretes outside body Type 1 Diabetes Genetic susceptibility to the disease Environmental event….virus or food Insulitis (inflammatory response in pancreas) Auto-immune attack on beta cells (antibodies)
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This note was uploaded on 02/25/2011 for the course BIO 101 taught by Professor Pytel during the Winter '11 term at Union College.

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January 5th - J anuary 5t h Homeostasis is never about...

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