Spermatogenesis Flashcards
How long does spermatogenesis take?
64 days
Where does spermatogenesis occur?
Seminiferous tubules of testes
What is process called when spermatids grow tails and become spermatozoa?
Spermiogenesis
What are 2 diff types of spermatogonia?
Type A- remain outside blood testis barrier- prod daughter cells
Type B- basal compartment- primary spermatocytes
How is sperm released into lumen?
Invagination in sertoli cells- retract- release sperm
How much sperm is made/sec?
300-600 sperm/sec/gram of testis
How are spermatozoa adapted? (3)
Haploid or diploid?
1) Tip nucleus covered with acrosome- enzyme penetrate ovum
2) Tail = flagellum- propel
3) Mitochondria- energy
Outline spermatogenesis?
What provides nutrients for spermiogenesis?
Sertoli cells
What secretes GnRH?
Effects what?
Hypothalamus
Effect pituitary gland- secrete LH and FSH
Men- cause tsticles make testosterone
What produces testosterone?
Leydig cells
Function leydig cells?
Produce testosterone
Does testosterone inhibit or stimulate testosterone?
How?
Inhibit
1) Act hypothalamus decrease GnRH- decrease LH
2) Act ant pit decease LH
What hormone stimulates testosterone secretion from leydig cells?
LH
What hormone stimulates testosterone secretion from leydig cells?
LH
