Male Flashcards
Structure of male reproductive system (9)
Vas deferens- extension of epididymis that transports sperm to the urethra and uses peristalsis to push sperm forward
scrotum- temp regulation and protection
testis- lobules consisting of convuluted tubules with seminiferous tubules that have germ cells that give rise to spermatagonia- cells of sirtilli to nourish and intestial cells between tubules to secrete testosterone for sex drive, sperm production and puberty
epididymis- store mature sperm
seminal vesicle- add alkaline fluid to the sperm to make the semen that nourishes and protects perm form alkalinity of vagina
prostate gland- adds enzymes to activate sperm in semen
Cowper’s gland- initial lubrication of urethra and neutralize acidity of urine
urethra- transport both semen and urine out of body
bladder-store urine for urination
cross section of penis and how it helps with sexual reproduction
nerve and dorsal arteries to fill with blood
central artery and corpus cavernosa to dilate with blood and stiffen
urethra with erectile rod called corpus sporangiosa for erection
define gametogenesis
formation of mature gametes that are haploid
Define spermatogensis
formation of mature sperm haploid gamete
Explain spermatogenesis
germ cells give rise to spermatagonia whcih undrgo mitosis to from new spermatagonia with a re diploid. these spermatagonia undergo growth to become primary diploid spermatocytes- which undergoes first miotic division to produce secondary spermatocytes with haploid chromosomes. these haploid chromosome spermatocytes are secondary and undergoe second miotic division to produce spermatids whuch specialize and differentiate to become sperm (loose cytoplasm and organelles)
Structure of sperm (8)
and how long survive
head- acrosome with enzymes to break through ovum
- nucleus with dna haploid
neck
body- mitochondria for energy to move
tail- and contractile fibres to move
survives 48 hrs and produced everyday
define ejaculation
expulsion of semen under high pressure
