International Board of Certified Lactation Consultant (IBCLC) Practice Exam

During which event do milk ducts undergo shortening, widening, and increase in diameter?

1. During breastfeeding

2. During lactogenesis

3. During milk ejection

4. During colostrum production

The correct answer is: During milk ejection

The correct choice is the event of milk ejection. During this process, also known as the let-down reflex, the milk ducts experience physiological changes that facilitate the movement of milk from the alveoli, where it is produced, through the ducts to the nipple. Milk ejection is primarily triggered by the release of the hormone oxytocin, which is released in response to stimuli such as the baby suckling. This hormone causes myoepithelial cells surrounding the alveoli to contract, leading to the shortening and widening of the milk ducts. As a result, the diameter of the ducts increases, allowing milk to be expelled efficiently. Understanding the mechanics involved during milk ejection is crucial for lactation consultants, as it impacts the breastfeeding experience for both the mother and the baby. Recognizing how this process improves the flow of milk can aid in addressing breastfeeding challenges and enhancing support strategies for nursing mothers. The other options do not accurately describe the physical changes occurring within the milk ducts during their respective processes. For instance, while breastfeeding involves sucking and nutrition transfer, it does not specifically detail the ductal changes that characterize milk ejection. Lactogenesis refers to the onset of milk production and colostrum production is focused on the development of the first