What occurs when the regulated value is different from the set point?

• A. Set Point
• B. Sensors
• C. Effectors
• D. Error Signal

Answer: (D)

When the regulated value differs from the set point, an error signal is generated. This signal indicates a discrepancy between the actual condition of a physiological parameter (such as temperature, pH, or blood glucose levels) and the desired target set point that the body aims for to maintain homeostasis. The presence of an error signal serves as critical feedback that informs the body that corrective actions need to be made to restore balance.

For instance, if the body temperature drops below the set point, this error signal will prompt mechanisms such as shivering or vasoconstriction to help raise the temperature back to the set point. Therefore, the error signal is essential for the functioning of feedback loops that regulate various physiological processes.