Which hormone is responsible for the milk 'letdown' reflex?

• A. Insulin
• B. Cortisol
• C. Oxytocin
• D. Melatonin

Answer: (C)

Verified step by step guidance

1. Identify the physiological process involved: The 'letdown' reflex is a physiological response that occurs in lactating mothers, facilitating the release of milk from the mammary glands.
2. Understand the role of hormones in this process: Hormones are chemical messengers that regulate various bodily functions, including lactation.
3. Review the function of each hormone listed: Insulin regulates blood sugar levels, Cortisol is involved in stress response, and Melatonin regulates sleep-wake cycles.
4. Focus on Oxytocin: Oxytocin is a hormone that plays a crucial role in childbirth and lactation. It stimulates the contraction of the milk ducts, aiding in the milk 'letdown' reflex.
5. Conclude with the correct hormone: Based on the understanding of each hormone's function, Oxytocin is responsible for the milk 'letdown' reflex.