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

• A. Development of bone density
• B. Regulation of blood glucose levels
• C. Increase in muscle mass from exercise
• D. Growth of hair and nails

Answer: (B)

Verified step by step guidance

1. Understand the concept of homeostasis: Homeostasis refers to the body's ability to maintain a stable internal environment despite changes in external conditions. It involves various physiological processes that regulate factors such as temperature, pH, and glucose levels.
2. Identify the key characteristics of a homeostatic mechanism: A homeostatic mechanism typically involves a sensor to detect changes, a control center to process this information, and effectors to bring about a response that restores balance.
3. Analyze each option to determine if it fits the criteria of a homeostatic mechanism: Consider whether the process involves regulation and feedback to maintain stability.
4. Evaluate the option 'Regulation of blood glucose levels': This process involves sensors (like the pancreas detecting blood glucose levels), a control center (the pancreas releasing insulin or glucagon), and effectors (liver and muscle cells responding to insulin or glucagon) to maintain glucose levels within a narrow range.
5. Conclude that 'Regulation of blood glucose levels' is a homeostatic mechanism: It fits the criteria of maintaining internal stability through feedback and regulation, unlike the other options which are more related to growth or development rather than maintaining a stable internal environment.