In a negative feedback loop, what happens when a body parameter deviates from its set point?

In a negative feedback loop, what happens when a body parameter deviates from its set point?

• A. The parameter continues to diverge.
• B. The body initiates responses to return toward the set point.
• C. It triggers an irreversible change.
• D. It has no effect.

Answer: (C)

Negative feedback maintains balance by counteracting any deviation from a set point. When a parameter strays from its target value, sensors detect the mismatch and trigger effectors to move the parameter back toward the set point, restoring normal function. This is how systems like temperature regulation or blood glucose control work: if you get too warm, cooling responses are activated; if you run high after a meal, mechanisms lower it back down. The aim is to bring the value back to normal, not to let it keep changing, not to cause irreversible shifts, and not to ignore the deviation.

Negative feedback maintains balance by counteracting any deviation from a set point. When a parameter strays from its target value, sensors detect the mismatch and trigger effectors to move the parameter back toward the set point, restoring normal function. This is how systems like temperature regulation or blood glucose control work: if you get too warm, cooling responses are activated; if you run high after a meal, mechanisms lower it back down. The aim is to bring the value back to normal, not to let it keep changing, not to cause irreversible shifts, and not to ignore the deviation.