1. Multiple Choice: Which hormone is primarily responsible for the regulation of metabolism? a) Insulin b) Thyroxine c) Estrogen d) Cortisol Correct Answer: b) Thyroxine Rationale: Thyroxine, produced by the thyroid gland, plays a crucial role in metabolism, growth, and development. 2. True/False: The Body Mass Index (BMI) is a reliable tool for diagnosing obesity in all populations. Answer: False Rationale: BMI does not account for muscle mass and may not accurately represent body fat percentage or health status, particularly in athletic populations. 3. Fill-in-the-Blank: Th