Chapter 27 Connect
The head of the sperm is comprised of what three components?
-a nucleus -flagellar basal body -acrosome
List the events that occur during spermiogenesis.
-growth of a flagellum -loss of excess cytoplasm
Describe the function of the seminiferous tubules.
-passageway to transport sperm to the rete testis -site of sperm production
In the male, secondary sex organs include the:
-penis -a system of ducts -a system of glands
List four effects of dihydrotestosterone (DHT).
-sebum secretion which often leads to acne -darkening and thickening of the skin -development of axillary and facial hair -development of the pubic hair
Describe the function of the seminiferous tubules.
-site of sperm production -passageway to transport sperm to the rete testis
The testes produce: (Mark all that apply)
-testosterone -sperm
___ hormone directly stimulates production of testosterone from the interstitial cells.
LH
___ stimulates the interstitial cells of the testes to secrete androgens, mainly testosterone.
LH
The time period from the onset of gonadotropin secretion and reproductive development until a person attains full adult height is called ___.
adolescence
A wide or sac-like portion of a tubular organ such as a ductus deferens or uterine tube is called a(n):
ampulla
Falling levels of testosterone and inhibin may bring about a period of declining male reproductive function, called ___.
andropause
Each of the corpora cavernosa diverge to form a ___ on each side. These attach to the pubic arch.
crus
The two branchs of the penile artery are the dorsal artery and the ___ artery.
deep
Human somatic (body) cells are ___; they have ___ chromosomes.
diploid; 46
Two requirements must be met for sperm motility: ___ and an energy source (ATP).
elevated pH
The ___ receives sperm from the efferent ductules and sends sperm to the vas deferens.
epididymis
The site of sperm maturation and storage is the ___.
epididymis
A tissue that functions by swelling with blood is known as ___ tissue.
erectile
Ejaculation occurs in two stages called emission and ___.
expulsion
The paramesonephric (mullerian) ducts will develop into the ___ reproductive tract.
female
The connective tissue cord that extends from the gonad to the floor of the abdominopelvic cavity during development is the ___.
gubernaculum
Name the region of the spermatozoon that contains the nucleus.
head
The scrotum is divided into right and left compartments by the ___ septum.
median
The internal genitalia are located mainly within the ___ cavity.
pelvic
The diamond shaped area between the thighs, bordered by the pubic symphysis, ischial tuberosities, and coccyx is the ___.
perineum
Meiosis I of spermatogenesis gives rise to two equal-size, haploid and genetically unique ___ spermatocytes.
secondary
The ductus deferens, cremaster muscle, pampiniform plexus, and testicular artery are located in the ___ ___.
spermatic cord
The binding of testosterone by ABP (androgen-binding protein) leads to the onset and rising rate of ___.
spermatogenesis
A pear-shaped head and a long tail are the two major parts of a ___.
spermatozoon
Blood leaves the testis by way of the pampiniform plexus of veins which converge to form the ___ vein.
testicular
Androgen-binding protein (ABP) raises the level of the hormone ___ in the seminiferous tubules and epididymis by binding and accumulating this hormone.
testosterone
The binding of ___ by androgen-binding proteins in the seminiferous tubules leads to the onset of spermatogenesis.
testosterone
In prophase I of meiosis, each pair of homologous chromosomes line up side by side and form a ___.
tetrad
Infertility is defined as:
the inability to fertilize an egg
True or false: Neurons in the male brain convert testosterone to estrogen which influences the behavior associated with libido.
true; estrogen is a "female" sex hormone, but it directly affects behavior associated with libido.
True or false: Elevated levels of FSH and LH in males may produce male climacteric or andropause, a condition with symptoms similar to female menopause.
true; most males experience few effects from these hormonal changes, however a few will experience hot flashes, mood changes, and an illusion of suffocation.
