Changes in GnRH pulse frequency in females is controlled by circulating levels of
estrogen and inhibin
progesterone only
progesterone and inhibin
progesterone and inhibin
D.
progesterone and inhibin
High levels of estrogen and progesterone give negative feedback to the hypothalamus for the release of GnRH. Thus, inhibiting the gonadotropin release.
(a) Arrange the following hormones in the sequence of their secretion in a pregnant woman.
(b) Mention their source and the function they perform.
(a) Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
(b) Why is follicular phase in the menstrual cycle also referred as a proliferative phase ? Explain.
(c) Explain the events that occur in a Graafian follicle at the time of ovulation and thereafter.
(d) Draw a graafian follicle and label antrum and secondary oocyte
Identify the correct statement on 'inhibin'
is produced by granulosa cells in ovary and inhibits the secretion of FSH
is produced by granulosa cells in ovary and inhibits the secretion of LH
is produced by nurse cells in testes and inhibits the secretion of LH
is produced by nurse cells in testes and inhibits the secretion of LH
(a) Briefly explain the events of fertilisation and implantation in an adult human female.
(b) Comment on the role of placenta as an endocrine gland.
