Male reproductive hormones ( final)
What is the secretion of follicle stimulating hormone inhibited by?
Inhibin from nurse cells in response to sperm formation
What is the concentration of testosterone level like at birth?
Low concentration
When does testosterone begin to secrete?
7th week of embryonic life -peaks at 6 months of fetal development
When does the concentration of testosterone increase?
@ puberty in response to GnRH
What secretes inhibin?
Nurse cells ---> decreases FSH, and GnRH production
What is the function of gonadotropin- releasing hormone (GnRH) ?
Stimulates secretion of follicle stimulating hormone & luteinizing hormone From the anterior pituitary
What is the function of the Luteinizing hormone?
Stimulates secretion of testosterone and other androgens from the interstitial cells of the testes
What is the function of follicle stimulating hormone?
Works with testosterone to stimulate nurse cells - promotes spermatogenisis & spermiogenisis - Secrete androgen binding protein -secrete inhibin
What gland secretes Luteinizing hormone?
anterior pituitary
What gland secretes the follicle stimulating hormone?
anterior pituitary
Where does the gonadotropin- releasing hormone (GnRH) come from?
hypothalamus
Where is the steroid hormone found and how does it travel?
in blood and it travels by binding to proteins 1) gonadal steroid binging globulins (66%) 2) albumin (34%)
What does the peak of testosterone do?
surge stimulates differentiation of male duct system, accessory organs & hypothalamus development
Describe the way of secretion and what can occur to gonadotropin- releasing hormone (GnRH) ?
- It is secreted in pulses, not continuous (every 60-90mn) - Secretion may be inhibited by inhibin from nurse cells in response to sperm formation
What are the functions of testosterone?
- Stimulates spermatogenisis by stimulating nurse cells -role in sexual drive and related behaviors - protein synthesis, bone and muscle growth - Secondary sex characteristics -maintain accessory glands & organs of the reproductive tract
What are the hormones involved with the male reproductive system?
- gonadotropin- releasing hormone (GnRH) - Follicle- stimulating hormone ( FSH) -Luteinizing hormone (LH) - Testosterone -inhibin
