Which of the following best describes leptin?

• A. A neurotransmitter involved in synaptic transmission.
• B. A structural protein found in the cytoskeleton.
• C. An enzyme that breaks down glucose during glycolysis.
• D. A hormone produced by adipose tissue that regulates appetite and energy balance.

Answer: (D)

Verified step by step guidance

1. Understand the role of leptin: Leptin is a hormone, not a neurotransmitter, structural protein, or enzyme. It is produced by adipose (fat) tissue and plays a key role in regulating appetite and energy balance.
2. Clarify the function of leptin: Leptin communicates with the hypothalamus in the brain to signal satiety (feeling full) and helps regulate energy homeostasis by controlling food intake and energy expenditure.
3. Eliminate incorrect options: Review the other choices provided. Leptin is not involved in synaptic transmission (neurotransmitter), cytoskeletal structure (structural protein), or glycolysis (enzyme).
4. Focus on the correct description: The correct answer highlights leptin's role as a hormone produced by adipose tissue, emphasizing its importance in appetite regulation and energy balance.
5. Summarize the concept: Leptin is a key hormone in maintaining energy homeostasis, ensuring the body balances energy intake with energy expenditure, and preventing excessive fat accumulation.