Which of the following is an example of a negative feedback mechanism in the human body?

• A. Regulation of blood glucose levels by insulin
• B. Generation of nerve impulses
• C. Release of oxytocin during childbirth
• D. Blood clotting during injury

Answer: (A)

Verified step by step guidance

1. Understand the concept of negative feedback mechanisms: Negative feedback is a process that counteracts a change in a physiological variable to maintain homeostasis. When a change occurs, the body initiates a response that reverses the direction of that change.
2. Identify the role of insulin in blood glucose regulation: Insulin is a hormone produced by the pancreas that helps lower blood glucose levels. When blood glucose levels rise, insulin is released to facilitate the uptake of glucose by cells, thereby reducing blood glucose levels.
3. Compare the examples provided: Evaluate each option to determine if it fits the definition of negative feedback. Negative feedback involves a response that negates or reduces the initial stimulus.
4. Analyze the regulation of blood glucose levels by insulin: This process involves the detection of high blood glucose levels, the release of insulin, and the subsequent decrease in blood glucose levels, which is a classic example of negative feedback.
5. Conclude why the regulation of blood glucose levels by insulin is the correct example: The process of insulin regulating blood glucose levels involves a feedback loop that reduces the initial stimulus (high blood glucose), fitting the definition of negative feedback.