Which of the following is an example of negative feedback?

• A. Blood clotting during injury
• B. Regulation of blood glucose levels by insulin
• C. Action potential propagation in neurons
• D. Release of oxytocin during childbirth

Answer: (B)

Verified step by step guidance

1. Understand the concept of negative feedback: Negative feedback is a mechanism that reduces the output or activity of any organ or system back to its normal range, maintaining homeostasis.
2. Identify the role of insulin in blood glucose regulation: Insulin is a hormone that helps lower blood glucose levels when they are too high, bringing them back to a normal range.
3. Compare the examples given: Blood clotting during injury and release of oxytocin during childbirth are examples of positive feedback, where the response enhances the original stimulus.
4. Recognize that action potential propagation in neurons is not a feedback mechanism but a process of nerve signal transmission.
5. Conclude that the regulation of blood glucose levels by insulin is an example of negative feedback, as it involves reducing blood glucose levels to maintain homeostasis.