A&P ch 27 men reproductive
The function of the blood tests barrier is
To prevent an autoimmune reaction to sperm
what causes menses to stop?
a rise in estrogen
what prevents menses if pregnancy occurs
a rise in hCG which causes a rise in progesterone
how many sperm per ejaculate would equate to normal fertility?
about 20 million
what type of tissue forms the majority of a non-lactating breast
adipose tissue
which hormone causes the endometrial glands to grow and develop
estradiol
What is cryptorchidism?
failure of testes to descend
which part of the endometrium is sloughed during menses?
functional zone
where does fertilization occur in the oviduct
infundibulum
what is menses
menstrual flow
what potent vasodilator is critical for stimulating erection?
nitric oxide
are new ocyocytes developed during a woman's reproductive lifetime
no
the cells that are critical for directly supporting spermatogenesis are
sertolic cells
A cell in the seminiferous tubules that is undergoing spermiogenesis is action
spermatid
where can sperm capable of fertilizing an ovum be found?
tail or cauda of the epididymis
what is the negative feedback that regulates LH release from the pituitary?
testosterone
LH stimulates
testosterone production by Leydig cells
what causes menses to start?
the drop in progesterone and estrogen in the blood
Spermiogenesis involves
the growth of the tail and loss of cytoplasm as the cell changes to look like a sperm prior to moving to the epididymis
the cell that enters meiosis is
the primary spermatocyte
what forms the blood-tests barrier?
tight junctions between Sertoli cells
function of pampiniform plexus
to cool the blood going to the testes and warm the blood coming from the testes.
The cremaster reflex
to raise and lower the testes so that it will be warmer or cooler and maintain the testes at the appropriate temperature for spermatogenesis to occur.
Sertoli cells make
Androgen binding protein and inhibin
Leydig cells
Are located between the seminiferous tubules & produce testosterone which helps spermatogenesis occur in the Tubules
which hormone causes secondary and anthill follicles to grow and become Graafian follicles
FSH
which hormone stimulates LH and FSH release from the pituitary
GnRH
which hormone cause the corpus luteum to form from the remnants of an ovulated follicle
LH
Erection involves
Parasympathetic release of nitric oxide to dilate arterioles and fill the corpora with blood.
What is the key, early factor in the normal process of determination of gender?
Presence of the SRY gene and expression of its protein
A cell in the seminiferous tubules that is undergoing meiosis is a
Spermatocyte
A male reproductive system tract develops internally because
Testosterone stimulates wolffian duct development while AMH inhibits Müllerian duct development