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Alyssa Melesurgo

Physio wks 1-7

TermDefinition
Homeostasis Refers to stability, balance, or equilibrium within a cell or the body. It is an organisms ability to keep a constant internal enviornment
Negative feedback loop occurs when feedback (from sensor to integrator) results in a reversal of the direction of change. negative feedback tends to stabilize a system, correcting deviations from the setpoint.
Positive feedback loop Occurs when feedback (from sensor to integrator) results in an amplification of the change ( same direction as deviation from setpoint). Can be stopped only if feedback loop is broken
Variable The characteristic that is controlled.
Sensor Detects the value of the variable.
Integrator Compares the actual value of the variable to a pre-determined set point value. *If significant deviation from 'normal range' integrator sends its own signal to the effector mechanism
Effector Instrument that has an effect on the variables. *Are organs, muscles, or glands that directly influence controlled physiological variables. The effectors action is what keeps them in normal range.
Set point The range of normal 'normal range' is referred to as the set point
4 basic components in every feedback control loop: 1. Sensor mechanism 2. Integrator or control center 3. effector mechanism 4. feedback
afferent and efferent directional terms used in physio Afferent: A signal is traveling TOWARDS a particular center or point of reference Efferent: The signal is traveling AWAY from a center or other point of reference.
Levels of Homeostatic control: 1. Intracellular control - mechanisms that operate at the cellular level. 2. Intrinsic control - mechanisms that operate at the tissue and organ levels. 3. Extrinsic control - outside control operates at system level.
What are the 4 major groups of organic substances in the human body: 1. Carbohydrates 2. Lipids 3. Proteins 4. Nucleic acids + related molecules
Created by: Amelesurgo
 

 



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