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Announcements• Download Powerpoint files AFTER lecture from
password-protected website• Students interested in Feeding Behavior
Research on Thursday afternoon are encouraged to contact Dr. Davis
• Study questions will be updated to be consistent with 11th edition of the text.
• Contact Dr. Davis regarding changes in lab days.
• Check email for first assignment due Friday.
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Homeostasis:
• The relative constancy of the internal environment
• Steady state vs. equilibrium
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The body: A society of interdependent cells, each type with its own needs and contributions.
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O2
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Cell Membrane: selectively permeable
Capillaries: highly permeable except to proteins
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Homeostasis
• Regulated via reflex arcs and naturally maintained by the process of negative feedback
• Measurement– Which physiological variables?– Averages and ranges
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Fig. 01.08
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Thermoregulation
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Physics of thermal energy flow
Cell metabolism=main source of heat
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• Conduction
• Convection
• Evaporation
• Radiation
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Mechanisms of thermoregulation
For constant body temp heat in = heat out
• Reflex arc
• Negative feedback
• Examples
• Acclimatization vs. adaptation
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