GU 19.2 NOT COMPLETE DONT USE Flashcards
What are the male reproductive system organs?
Testes, system of ducts
What are the system of ducts in the male reproductive system?
epididymis
ductus deferense (vas)
ejaculatory ducts
urethra
What are the accessory sex glands?
seminal vesicles
prostate
bulbourethreal glands
What are some support structures of the male reproductive system?
scrotum and penis
What produces sperm?
spermatogenic cells that line the seminiferous tubles
What is the role of sertoli cells?
support, protect, and nourish spermatogenic cells
phagocytize degenerating spermatogenic cells
secrete fluid for sperm transport
release inhibin that regulates sperm production
What cells secrete the hormone testosterone?
Leydig cells
What is the hormone that promotes the development of masculine characteristics?
Androgen
What temperature is optimal for the production and survival of sperm?
2-3 C below body temp
What is the process by which seminiferous tubules of the testes produce sperm?
spermatogenesis
What are the three phases of spermatogenesis?
Meiosis I
Meiosis II
Spermiogenesis
When does spermatogenesis occur?
during puberty and continues throughout life
What is the time frame from onset cell division in a spermatogonium until sperm is released into the lumen of a seminiferous tubule?
65-75 days
What is the diploid number of chromosomes?
46
What occures during Meiosis I? (broad)
replication of chromosomes
What occurs in meiosis II? (broad)
Division of chromatids into spermatids
Spermatids develop into what?
Single sperm cell
What rate is sperm produced per day?
300 million per day
Most sperm die in the female reproductive tract within what time frame after ejaculation?
48 hrs
What are the major parts of the sperm cell?
head and tail
What does the sperm head contain?
nuclear material (DNA)
acrosome (penetrating enzyme)
The tail of sperm is divided into what parts?
neck
middle piece (mitochondria)
principle piece (tail)
end piece (tapering potion of tail)
Mitochondria in the middle piece of the sperm tail is used for what?
provides ATP for locomotion
Sperm travels through the seminiferious tubles into what structure?
epididymis
What is the site for sperm maturation?
Ductus epididymis
What forms the ejaculatory ducts?
union of the ductus deferens and the seminal vesicles
What does the urethra pass through?
prostate
deep perineal muscles
penis
What secretes most of the liquid portion of semen?
accessory sex glands
What secretes an alkaline, viscous fluid that contains fructose, prostaglandins and clotting proteins?
Seminal vesicles
Fructose is used for what by sperm?
ATP production
What is the percentage of the volume of semen is fluid secreted by the seminal vesicles?
60%