reproduction - males Flashcards
(15 cards)
what are the male chromosomes in mammals
xy
structure and function of testes
sits inside scrotum
produces sperm and testosterone
structure and function of epididymis
long coiled tube on each testicles surface
mature sperm are stored here
structure and function of vasdeferens
tube leading out of epididymis
transports sperm to urethra
structure and function of the prostate gland
surrounds urethra, ball like
secretes clear liquid which nourishes and protects sperm by removing bacteria
structure and function of urethra
muscular tube from bladder and prostate to tip of penis
transports urine and semen out of body
structure and function of bulbus glandus
erectile tissue that swells during mating
to form a lock after penetration
structure and function of prepuce
(foreskin)
layers of skin
protects penis
structure and function of the penis
varies between species, often includes a baculum
allows for penetration
where is sperm made
seminiferous tubule walls
what cells provide nutrients and blood to immature sperm cells
sertoli cells
how do sperm cells divide
meiosis
outline the process of sperm production
- made in seminiferous tubules
- scattered sertoli cells provide blood and nutrients to immature sperm cells
- sertoli cells move young germ cells from the outer surface to the central channel of the tubule
- multiply by meiosis, half remain as stem cells and half become sperm cells with half their chromosomes
- maturing sperm change shape
what are the male chromosomes in birds
zz
how to tell which animals are male
- chromosones
- temperature sex dependant in turtles and crocodiles
- penis
- hormones