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Homeostasis
A&P Ch 2 PCP310
Term | Definition |
---|---|
Homeostasis | Self-regulating process by which a living organism can maintain internal stability while adjusting to changing external conditions ie. regulating blood pH levels |
Sensor Mechanism | Specific sensors detect and react to any changes away from the normal |
Integrating Mechanism (control centre) | information changes are analyzed and integrated and then if needed, a specific action is initiated |
Effector Mechanism | Effectors directly influence controlled physiological variables |
Feedback | Process of information about a variable constantly flowing back from the sensor to the integrator |
Negative Feedback | Produces action opposite to the change that activated the system to maintain homeostasis |
Postive Feedback | Amplifies or reinforces the change that is activated to disrupt homeostasis |
Intracellular Control | Regulation within a cell using genes and enzymes |
Intrinsic Control | Regulation within tissues and organs that may involve chemical signals |
Extrinsic Control | Regulation from organ to organ that may involve nerve or endocrine signals |