10HormHomeolTemplate - April 10, 2008 Physiology and...

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April 10, 2008 Physiology and Homeostasis o Complex multicellular animals have a hierarchical levels of organization Cells organized into tissue organized into organs organized into organ systems Emergent properties appear at each new level (characteristics that are seen at the higher level that were not exhibited at the level below) o Complex living systems exhibit homeostasis Homeostasis o The ability to maintain a constant internal environment despite fluctuating external environment. Requires internal communication about the state of the organism o Concentration of important molecules in body fluids have SET POINTS – the level at which a physiological state is regulated Get above set point, respond by lowering Get below set point, respond by raising Like a thermostat in a house connected to heating and cooling systems *set point may change throughout day or life of organism. Ex. Body temperature drops at night to save energy. Temperature is till regulated, but at lower rate Signaling Molecules o Recall different ways to send a signal: Autocrine: same cell sends and receives signal Paracrine: one cell sends signal other cell(s) receive signal o Recall location of target- close or distant o Local signaling molecules: Neurotransmitters, histamines, etc. o
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This note was uploaded on 04/22/2008 for the course BIOL 111 taught by Professor Dr.zielinski during the Spring '08 term at Purdue University-West Lafayette.

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10HormHomeolTemplate - April 10, 2008 Physiology and...

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