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Questions and Answers
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?
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?
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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?
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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.
