Hormones And The Menstural Cycle Flashcards
What does LH do in spermatogenesis:
-binds to leydig cells
-leydig cells produce and secrete testosterone
This initiates spermatogenesis
What does LH do in oogenesis
-binds to follicle cells. In ovaries
-stimulates ovaries to mature annd release oestrogen
-surge in LH causes secondary oocyte to be released from mature follicle= ovulation
-LH. Causes development of corpus luteum
-progesterone is released from corpus luteum
FSH role in spermatogenesis.
-binds to Sertoli cells which become activated
-Sertoli cells secrete inhibin and become receptive to testosterone
This initiates sprmatogenesis
FSH role in oogenesis
-binds to follicle cells. In ovaries
-stimulates ovaries to mature
-stimulates the release of oestrogen
Role of INHIBIN in Gametogenesis
Inhibits FSH by negative feedback
Role of testosterone in spermatogenesis
-binds to sertoli cells.
-initiates spermatogenesis
-inhibits LH by neg feedback
Role of oestrogen in oogenesis
elevated levels of oestrogen:
-inhibit FSH by neg feedback.
-cause a surge in LH
Role of progesterone in oogenesis
-inhibits FSH and LH by negative feedback
Role of FSH within the menstrual cycle
-stimulates development of Graafian follicle
-indirectly stimulates the production of oestrogen which inhibits FSH secretion
-FSH levels surge at the point of ovulation
Role of LH in the menstrual cycle
-causes ovulation (release of secondary oocyte)
-stimulates development of corpus luteum
-stimulates the secretion of progesterone
Role of PROGESTERONE in the menstrual cycle.
-maintains the endometrium for implantation of fertilised ovum
-stimulates glandular activity to thicken cervical mucus
-inhibits LH,FSH,GnHR and further ovulation
Role of OESTROGEN in the menstrual cycle
-promotes the repair of the endometrium
-stimulates further growth of the follicle.
-levels rise in the first 12 days of the MC
