Which process involves amplifying a small initial change?

Which process involves amplifying a small initial change?

• A. Negative feedback
• B. Positive feedback
• C. Endocrine Hormones
• D. Hormones

Answer: (B)

Positive feedback amplifies a small initial change. In this type of regulation, the response pushes the system further away from its starting point, creating a progressively larger effect until an ending event stops the process. A classic example is the blood clotting cascade: an injury triggers initial clotting that activates more clotting factors, accelerating the buildup until a stable clot forms. Another well-known case is the contractions during labor, where the initial stretch and hormonal signals intensify contractions to drive birth forward. Negative feedback does the opposite, damping deviations to restore a set point rather than amplifying them. Hormones and endocrine hormones are signaling molecules involved in regulation, not the mechanism of amplification itself.

Positive feedback amplifies a small initial change. In this type of regulation, the response pushes the system further away from its starting point, creating a progressively larger effect until an ending event stops the process. A classic example is the blood clotting cascade: an injury triggers initial clotting that activates more clotting factors, accelerating the buildup until a stable clot forms. Another well-known case is the contractions during labor, where the initial stretch and hormonal signals intensify contractions to drive birth forward. Negative feedback does the opposite, damping deviations to restore a set point rather than amplifying them. Hormones and endocrine hormones are signaling molecules involved in regulation, not the mechanism of amplification itself.