Which of the following statements about feedback mechanisms is most accurate?

• A. Negative feedback loops work to restore a system to its set point.
• B. Positive feedback loops are more common than negative feedback loops in the body.
• C. Negative feedback loops amplify changes in the body.
• D. Positive feedback loops help maintain homeostasis by reversing changes.

Answer: (A)

Verified step by step guidance

1. Begin by understanding the concept of feedback mechanisms in physiology. Feedback mechanisms are processes that help maintain homeostasis in the body by regulating physiological functions.
2. Identify the two main types of feedback mechanisms: negative feedback loops and positive feedback loops. Negative feedback loops work to counteract changes and bring the system back to its set point, while positive feedback loops amplify changes and move the system away from its set point.
3. Examine the statement: 'Negative feedback loops work to restore a system to its set point.' This is a key characteristic of negative feedback loops, as they are designed to stabilize physiological processes by reversing deviations from the norm.
4. Consider the statement: 'Positive feedback loops are more common than negative feedback loops in the body.' In reality, negative feedback loops are more prevalent because they help maintain stability and homeostasis, whereas positive feedback loops are less common and typically occur in specific situations like childbirth.
5. Evaluate the statement: 'Positive feedback loops help maintain homeostasis by reversing changes.' This is incorrect because positive feedback loops actually enhance or amplify changes, moving the system further from its set point, which is contrary to maintaining homeostasis.