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Mia Battilega

Physiology Assignment 1 (week 1-7)

Homeostasis Concept of internal stability; a condition that may very but relatively stays the same
What are the four basic components of a control system 1. Sensor mechanism 2. Integrator or control center 3. Effector mechanism 4. Feedback
Afferent Signal traveling toward a particular center or point of reference
Efferent Signal is moving away from the center or other reference point
Negative feedback Oppose or “negate” a change by creating a response that is opposite in direction to the initial disturbance
Positive feedback Amplify or reinforce the change that us occurring
Feed-forward Concept that information may flow ahead to another process to trigger a change in anticipation of an event that will follow Ex; eating a meal—stomach stretches and triggers stretch sensors in wall of stomach
What are the three levels of homeostatic control? 1. Intracellular control 2. Intrinsic control 3. Extrinsic control
Intracellular control Mechanisms operate at the cell level (genes and enzymes)
Intrinsic control Mechanisms operate at the tissue and organ levels (auto-regulation) Ex: cardiac muscles stretch and muscle automatically contracts w/ more force
Extrinsic control “Outside” control and operates at the system and organism level Ex: nervous and endocrine regulation (nerve signals and hormones originate outside the controlled organ)
Created by: Miabattilega
 

 



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