Discuss the hormonal control of milk production and ejection
What will be an ideal response?
During gestation elevated placental estrogen and progesterone promote development of ducts and alveoli in mammary glands. Prolactin stimulates synthesis of enzymes essential for milk production by alveolar epithelial cells. Withdrawal of placental steroids at parturition initiates lactation. Lactation is sustained by suckling, which triggers release of oxytocin and prolactin. Oxytocin causes milk ejection by stimulating cells surrounding alveoli to squeeze secreted milk out through ducts. Prolactin stimulates secretion of more milk to replace milk ejected as baby nurses.
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a. frontal lobe b. parietal lobe c. occipital lobe d. temporal lobe
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A) homozygous B) monogamous C) heterozygous D) hemizygous
Muscles that cause movement are known as ________.
A. antagonists B. agonists C. secondary movers D. points of insertion