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BIOL 1412 (89)

BIOL1412 01 06 2014.docx

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Biological Sciences
Course Code
BIOL 1412
Paul Messing

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January 16, 2014 Topic I: Intro to Physiology Physiology • study of how the body function Homeostasis • the ability to maintain relatively stable conditions in internal environment (despite changes in external environment) • cells can only survive w/in a narrow range of con'ds • ∴ body conditions must be maintained w/in physiological limits • conditions controlled include  pH, temperature, 2, 2, blood pressure (bp), intra + extracellular (ICF + ECF) fluid volumes • organ systems function together to maintain homeostasis (Fig. 1.2) • disease = failure to maintain homeostasis • Nervous and/or Endocrine system(s) control all other systems (control centers)  Act to: a. maintain homeostasis b. permit departures from homeostasis in as controlled manner  eg. pregnancy, growth, sudden fright Homeostatic Regulation • change in int. env't must be detected or anticipated • then NS and/or endocrine respond altering system(s) responsible for that condition • Types of NS/Endocrine Responses: 1) Anticipatory Resp
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