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Questions and Answers
What is the main function of the integrator in a homeostatic control system?
What is the main function of the integrator in a homeostatic control system?
In a negative feedback mechanism, what is the primary role of the effector?
In a negative feedback mechanism, what is the primary role of the effector?
What is a common deficiency associated with homeostatic control systems that leads to delayed responses?
What is a common deficiency associated with homeostatic control systems that leads to delayed responses?
How does positive feedback differ from negative feedback in a homeostatic control system?
How does positive feedback differ from negative feedback in a homeostatic control system?
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In an aquarium example given for homeostatic control, what component represents the control box that maintains the set state?
In an aquarium example given for homeostatic control, what component represents the control box that maintains the set state?
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What type of control system involves reflex control and utilizes hormones for coordination across organ systems?
What type of control system involves reflex control and utilizes hormones for coordination across organ systems?
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Study Notes
Homeostatic Control System
- A system that maintains a stable internal environment despite changes in the external environment
- Components:
- Stimulus: a change in the environment that triggers a response
- Receptor/Sensor: receives the stimulus and sends a signal to the integrating center
- Integrating Center: compares the stimulus with the set point and sends a signal to the effector
- Effector: makes a corrective response to restore the set point
Mechanism of Homeostatic Control
- Stimulus → Sensor → Afferent Pathway → Integrating Center → Efferent Pathway → Effector
- Example: Aquarium thermostat
- Stimulus: low temperature
- Receptor: thermometer
- Afferent Pathway: pathway to integrating center
- Integrating Center: control box set at 20°C
- Effector: heater turns on
Levels of Homeostatic Control
- Intracellular: within the cell (e.g. ion concentration)
- Local or Intrinsic: within a tissue or organ (e.g. reflex control)
- Organ System: with the help of hormones (e.g. endocrine system)
Negative Feedback Mechanism
- Opposes the variable that has been changed
- Delays:
- Delayed response: stimulus goes through many pathways before receiving a response
- Shutting effector delay: effector takes time to respond
Deficiencies of Homeostatic Control
- Unable to adapt to environment
- Solutions:
- Anticipation or feed forward system: prepares the body for a change in the environment (e.g. migration to a different temperature)
Positive Feedback Mechanism
- Initial stimulus → response → stimulus ↑
- Requires an outside factor to shut off the feedback cycle
- Example: initial stimulus → response → stimulus ↑
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Description
Test your knowledge about the components of a homeostatic control system including stimulus, receptor, integrator, effector, and their roles in maintaining internal balance. Explore examples like an aquarium to understand the mechanism of response.
