ANP - 1. Room Assignments for Exam (Wednesday, October 14)...

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1. Room Assignments for Exam (Wednesday, October 14) A) MNT 202: Last name begins A-R B) LMX 390: Last name begins S-Z You must go to your assigned room because that is where your copy of the exam will be. 2. Forum Question #1 has been posted. Read your instructions carefully and post in the correct folders. Do NOT use attachments. Private postings in public folders will be deleted. Remember to work as a team and, team leaders: Remember to put your Group number in the title of your posting!
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3. HOMEOSTASIS: CONTROL MECHANISMS 3.1 Define & identify the principal characteristics of homeostasis (pp.8-11) 3.2 Introduction to the Nervous System (pp. 525-528, 535-541) 3.3 Introduction to the Endocrine System (pp. 595-608) J. Carnegie, UofO
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3.1.1 define homeostasis, giving at least 2 physiological examples Walter Cannon: ability of the body: to maintain relatively stable internal conditions even though there is continuous change in the outside world” • not unchanging - rather a dynamic state of equilibrium involving many systems: (i) adequate blood levels of vital nutrients (ii) (iii) wastes must not accumulate (iv) body temperature http://del.icio.us/jleather/Temperature
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3 essential characteristics: receptor: senses change ( stimulus ) ( afferent pathway ) to: control centre: determines set point for variable maintenance; analyzes effector : provides means for response ( output along efferent pathway ) feedback (negative/positive) allows for regulation within a range/enhanced response 3.1.2 list the 3 essential components of a homeostatic control mechanism, defining the roles of each Fig. 1.4
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J. Carnegie, UofO goal of negative feedback: prevent sudden, severe changes 3.1.3 differentiate between positive and negative feedback; define disease and aging in terms of homeostasis Negative Feedback Mechanisms output reduces or shuts off stimulus (i) 1 hormone regulating a process: negative feedback secretion (ii) process regulated in opposite directions by 2 different hormones – eg: blood glucose Fig. 16.18
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most disease seen as a disturbance of homeostasis = homeostatic imbalance aging associated with progressive decrease in our ability to maintain homeostasis greater risk for illness Positive Feedback Mechanism • response of mechanism enhances original stimulus output is further stimulated change occurs in same direction as original response goal to be attained eg: blood clotting - how is this still, overall, maintaining homeostasis?? Fig. 1.6
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ANP - 1. Room Assignments for Exam (Wednesday, October 14)...

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