Unit 2-KA2 Flashcards
Describe the role of ICSH
ICSH-
Stimulates interstitial cells to produce testosterone
Describe the role of the pituitary gland in male reproduction
Releases FSH-
promotes sperm production in seminiferous tubules
Releases ICSH-
stimulates interstitial cells in the testes to produce testosterone
Describe the effect of testosterone on the testes of an adult male
Testosterone-
Stimulates sperm production in seminiferous tubules
Explain how the concentration of testosterone in the blood is prevented from becoming too high
Overproduction of testosterone is prevented by a negative feedback mechanism
High testosterone levels inhibit the secretion of ICSH and FSH from the pituitary gland-resulting in a decrease of testosterone production by the interstitial cells
Describe the role of the corpus luteum
Secretes progesterone
Describe the role of the following hormones in the mentrual cycle-
FSH
LH
FSH-
Stimulates the development and maturation of a follicle surrounding the ovum
Stimulates production of oestrogen by the follicle
LH-
Triggers ovulation
Causes vascularisation and development of the corpus luteum which produce progesterone
Describe the roles of oestrogen and progesterone in the menstrual cycle
Oestrogen-
Stimulates proliferation of the endometrium preparing it for implantation
Progesterone-
Promotes further development and vascularisation of the endometrium preparing it for implantation
Describe the changes in the concentrations of progesterone and FSH in a women’s blood if she becomes pregnant
Progesterone levels remain high
FSH levels drop
Explain what prevents further development of follicles when an embryo is developing in the uterus
High progesterone levels have a negative feedback effect on the pituitary gland, resulting in the inhibition of FSH and LH
Inhibition of FSH prevents further follicles from developing
