BIO2A03-2011-L2-template

BIO2A03-2011-L2-template - Biology 2A03 Lecture 2...

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Biology 2A03 Lecture 2 Homeostatic Control Systems Cell, tissue and compartments
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Simplified View of Overall Plan of Human Body Fig 1.4
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The Internal Environment Total Body Water = Intracellular H 2 O L Interstitial H 2 O L Plasma H 2 O L ECF L or 60% body wt is rapidly transported by the circulation and mixes between blood and tissues by diffusion through . Baths tissues and makes up the of the body See Fig. 1-5 Proper cellular function depends on tight control of ECF components ICF
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Fig. 1-5
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Homeostasis A Defining Feature of Physiology Claude Bernard (1813-1878) Walter Cannon (1871-1945) Extended Bernard’s notion to the organization of cells, tissues and organs. First to coin the term “homeostasis” Noted that mammals are able to regulate their internal environment within a narrow range.
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input output Set point Basic Negative Feedback Control Examples: arterial blood pressure, body temperature, pH, PCO 2 See Fig 1.7
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a key component of control systems Involuntary, unpremeditated, unlearned
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This note was uploaded on 04/12/2011 for the course BIOL 2A03 taught by Professor Mccelland&dej during the Winter '11 term at McMaster University.

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BIO2A03-2011-L2-template - Biology 2A03 Lecture 2...

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