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.