Hormonal Control of Reproduction Flashcards
What reproductive hormones do hypothalamus release
GnRH (gonadotrophin releasing hormone)
What reproductive hormones do pituitary gland release
Anterior - FSH, LH, Prolactin
Posterior - oxytocin
What hormones do the gonads release
Ovary - oestrogen, progesterone, oxytocin, inhibin, relaxin
Testes - oestrogen, testosterone
What hormones do the placenta release
Oestrogen, progesterone, prostaglandin
What does GnRH do
Stimulate anterior pituitary to release LH and FSH
What does FSH and LH do
Stimulates spermatogenesis, follicles to release oestrogen/progesterone, release of testosterone, ovulation
Where is progesterone released from in the ovaries
Corpus luteum
What does oestrogen do in the menstrual cycle
Decreases release of GnRH, LH, FSH - negative feedback
What does progesterone do
Decrease GnRH, LH, FSH - negative feedback
Where is oxytocin released from in the ovaries
Corpus luteum
What does oxytocin do
Stimulate production of prostaglandin, unterine contraction
Where is prostaglandin released from
Uterus, placenta
What does prostaglandin do
Luteolysis
Where is testosterone released from in the testes
Leydig cells
What does prolactin do
Lactation
What are the four phases of oestrus
Proestrus
Oestrus
Metoestrus
Dioestrus
What happens in proestrus
Development of follicles, secretion of pheromone
What happens in oestrus
Sexual receptivity and usual ovulation
What happens in Metoestrus
Formation of corpus luteum and beginning of progesterone secretion
What’s dioestrus
Continued release of progesterone
What are the types of oestrus
Polyoestrous
Seasonal polyoestrous
Mono oestrous
