Which hormonal effect is noted during the menstrual cycle? a. ...

[Arii_bell]

Which hormonal effect is noted during the menstrual cycle?
 
  a. LH and FSH secretion rise during the ovulatory phase.
  b. A negative feedback mechanism is exhibited by the anterior pituitary gland and ovaries.
  c. The posterior pituitary gland secretes LH.
  d. Estrogen secretion enhances FSH secretion.

Question 2

Which hormone is responsible for milk production after the birth of the placenta?
 
  a. Pitocin
  b. Prolactin
  c. Estrogen
  d. Progesterone

[stano32]

Answer to Question 1

ANS: A
Levels of LH and FSH rise dramatically during the ovulatory phase and are known as the LH surge prior to ovulation. A positive feedback mechanism occurs with regard to the menstrual cycle. The anterior pituitary gland secretes LH. Estrogen secretion minimizes FSH secretion.

Answer to Question 2

ANS: B
During pregnancy, high levels of estrogen and progesterone produced by the placenta stimulate growth of the alveoli and ductal system to prepare them for lactation. Prolactin secretion by the anterior pituitary gland stimulates milk production during pregnancy, but this effect is inhibited by estrogen and progesterone produced by the placenta. Inhibiting effects of estrogen and progesterone stop when the placenta is expelled after birth, and active milk production occurs in response to the infant's suckling while breastfeeding. Pitocin is the hormone that causes the let-down reflex during breastfeeding.

[Arii_bell]

Gracias!

[Jossy]

TYSM