How does the anterior pituitary change during pregnancy?

How does the anterior pituitary change during pregnancy?

• A. Decreases in weight and volume
• B. Increases in weight and volume due to more prolactin-secreting cells; secretes ACTH
• C. Remains unchanged
• D. Atrophies

Answer: (B)

During pregnancy the anterior pituitary enlarges because the lactotroph cells multiply and enlarge (lactotroph hyperplasia), driving higher prolactin levels in preparation for milk production after birth. This increase in weight and volume reflects that cellular shift. At the same time, ACTH secretion tends to rise as placental CRH stimulates the pituitary, boosting adrenal cortisol to meet the metabolic and fetal-growth demands of pregnancy. Together, this hormonal adaptation supports mammary development and the pregnancy’s physiologic needs. The gland does not stay the same or shrink; it grows due to the proliferation of prolactin-secreting cells and the accompanying rise in ACTH.

During pregnancy the anterior pituitary enlarges because the lactotroph cells multiply and enlarge (lactotroph hyperplasia), driving higher prolactin levels in preparation for milk production after birth. This increase in weight and volume reflects that cellular shift. At the same time, ACTH secretion tends to rise as placental CRH stimulates the pituitary, boosting adrenal cortisol to meet the metabolic and fetal-growth demands of pregnancy. Together, this hormonal adaptation supports mammary development and the pregnancy’s physiologic needs. The gland does not stay the same or shrink; it grows due to the proliferation of prolactin-secreting cells and the accompanying rise in ACTH.