Negative Feedback Mechanisms

Negative Feedback

• Definition: A mechanism that corrects an abnormality or imbalance by moving in the opposite direction of the original stimulus, aiming to restore homeostasis.
• Purpose: To negate or counteract a deviation from a set point (e.g., feeling too cold, feeling too hot).

Mechanism of Negative Feedback

• Stimulus: An internal or external change that causes an imbalance (e.g., body temperature rise or fall).
• Receptor: Sensory organs or cells (e.g., skin for temperature) that detect the stimulus.
• Control Center: Processes the information received from the receptor and determines the appropriate response.
• Correction: Actions taken to counteract the stimulus and bring the body back to a normal state (homeostasis).

Examples of Negative Feedback

• Body Temperature Regulation:
  • If feeling too hot (body temperature rises), actions are taken to cool down (e.g., take off a shirt, drink water).
  • If feeling too cold (body temperature drops), actions are taken to warm up (e.g., drink hot beverages, put on a jacket, turn on a heater).
• Blood Glucose Regulation:
  • Regulated by insulin, addressing problems associated with medical conditions like diabetes.