Question

Galactopoiesis is

• A. Milk secretion
• B. Maintenance of lactation
• C. Milk down
• D. Ceasing of lactation

Hint:

- Lactogenesis = Initiation of milk secretion.
- Galactopoiesis = Maintenance of lactation.
- Milk let-down = Oxytocin-mediated ejection of milk.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Lactation in mammals is a complex physiological process regulated by endocrine hormones.
The process is divided into distinct stages: initiation, secretion, maintenance, and cessation of milk production.
Detailed Explanation:
Let us define the physiological terms associated with lactation:
- Lactogenesis (Initiation of Milk Secretion): The transition of the mammary gland from a non-secretory to a secretory state, occurring around parturition.
- Galactopoiesis (Maintenance of Lactation): The ongoing maintenance of established milk secretion over an extended period.
It requires the continuous synthesis of milk by mammary alveolar cells and is regulated by hormones such as prolactin, growth hormone (somatotropin), thyroid hormones, and cortisol, as well as the regular removal of milk by milking or suckling.
- Milk Let-Down (Milk Ejection): The reflex contraction of myoepithelial cells surrounding the alveoli, driven by the hormone oxytocin in response to tactile or sensory stimuli, which forces milk into the cisterns.
- Involution (Ceasing of Lactation): The regression of the mammary gland back to a non-secretory state after weaning or drying-off.
Therefore, Galactopoiesis refers specifically to the maintenance of lactation.

Step 2: Final Answer:
Galactopoiesis is the maintenance of lactation.