Lec1b - Physiological Regulations

Lec1b - Physiological Regulations - iii. Effector The...

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Lecture 1 – Physiological Regulations Reading: Chapter 1, pp. 12 – 13 Lecture Outline: What is Homeostasis? Regulatory Mechanisms: Direct Regulation Feedback - Positive - Negative Feed Forward Action Acclimatization/Acclimation
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Internal milieu (internal environment) Distinct internal environment despite external changes. Claude Bernard (1813-1878)
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Homeostasis What is Homeostasis? A Condition of Constancy Walter Cannon (1871-1945)
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Homeostasis is not an equilibrium ! Equilibrium = death
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Any change in the internal environment elicits a response which functions to minimize that change.
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Homeostasis of the body is a composite of the specialized functioning of individual cells, tissues, organs and organ systems.
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The efforts of all systems must be coordinated for the animal to survive.
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The Regulatory Systems Endocrine System Nervous System
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The Regulatory Mechanisms
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Components of Regulatory Mechanisms i. Receptor ii. Control center/Integrating Center
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Unformatted text preview: iii. Effector The receptor detects a change in some variable in the animals internal environment, such as a change in temperature. The control center processes the information it receives from the receptor and directs an appropriate response by the effector . Regulatory Mechanisms Direct Regulation Feedback - Positive- Negative Feed Forward Action Acclimatization Direct Regulation Negative Feedback Positive feedback uterine contractions during parturition Feed-Forward Action- Mechanism to anticipate a change in a regulated variable and improve the speed of the homeostatic response- example: temperature sensitive nerve endings in the skin Acclimatization- Improved functioning of an already existing homeostatic system.- Typically reversible.- Example: Recovering from jetlag. Acclimation A laboratory phenomenon....
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Lec1b - Physiological Regulations - iii. Effector The...

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