Prolactin is the hormone responsible for secreting milk.
Prolactin's Role in Milk Production
Prolactin is a crucial hormone that plays a significant role in lactation. The secretion of milk is a complex process, and prolactin is a key player in initiating and maintaining this process.
Key Aspects of Prolactin's Function
- Stimulates Mammary Tissue Growth: During pregnancy, prolactin levels increase significantly. This surge in prolactin stimulates the growth and development of the mammary tissue, preparing the breasts for milk production.
- Triggers Milk Secretion: Prolactin directly acts on the alveoli cells within the mammary glands. These cells are responsible for producing milk, and prolactin stimulates them to secrete milk (19).
- Maintains Lactation: While other hormones are involved in breastfeeding, prolactin is essential for continuing milk production once lactation has begun. Regular nursing or pumping helps to sustain prolactin levels.
How Prolactin Works
Here's a simplified look at how prolactin works:
- Pregnancy and Increased Levels: During pregnancy, prolactin levels rise dramatically, preparing the mammary glands for lactation.
- Stimulation of Mammary Tissue: Prolactin promotes the development and growth of the alveoli, the milk-producing cells.
- Milk Secretion: After delivery, prolactin acts on the alveoli to trigger the actual secretion of milk.
- Ongoing Maintenance: Continued breastfeeding or pumping helps maintain prolactin levels, ensuring ongoing milk production.
Summary
The hormone directly responsible for secreting milk is prolactin. It is vital for the preparation of the mammary tissue during pregnancy and the subsequent production and secretion of milk for breastfeeding.
