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_____ is/are generally accepted as a secondary sex characteristic.

the enlargement of the breasts

which of the following are primary sex organs?


which of the following is a secondary sex organ?


gonads begin to develop

5 to 6 weeks after fertilization

_____ determine/s whether an organism will be genetically male or female.

the sperm

the gene that codes for the testis-determining factor (TDF) is found in or on

the Y chromosome

the penis is homologous to

the clitoris

the ____ is the gonad and the ____ is the gamete.

testis; sperm

_____ stimulates the descent of the testes.


the ____ is an example of the female external genitalia.


this image shows a sagittal section of the male reproductive system. what does "4" represent?

bulbourethral gland

this image shows a sagittal section of the male reproductive system. what does "3" represent?

prostate gland

this image shows a section of the testis and scrotal contents. what does "2" represent?

ductus (vas) deferens

this image shows a sagittal section of the male reproductive system. what does "3" represent?

corpus spongiosum

from their formation to ejaculation, sperm cells take the following pathway:

seminiferous tubule, rete testis, epididymis, ductus deferns, ejaculatory duct, urethra.

when it is cold, the ____ contracts and draws the testes closer to the body to keep them warm.

cremaster muscle

the countercurrent heat exchanger that prevents arterial blood from overheating the testes is

the pampiniform plexus

the blood-testis barrier

prevents antibodies in the blood from getting to the germ cells.

by volume, most of the semen is produced in the

seminal vesicles

_____ are not found in the siminiferous tubules.

corpus cavernosum cells

the penile urethra is enclosed by the

corpus spongiosum

men have only one ____ but have two of all the rest of these.

prostate gland(s)

why would an enlarges prostate interfere with urination?

it compresses the urethra

the ____ is/are the site(s) of sperm maturation and storage.


all of the following play a role in thermoregulation of the testes except

the bulbospongiosus muscle

when do the testes start secreting testosterone?

in the first trimester of fetal development

which of the following hormones directly stimulates the development of male secondary sex characteristics?


which of the following is an androgen?


_____ stimulates the interstitial cells of the testes to secrete _____.

luteinizing hormone (LH); testosterone

which hormone suppresses spermatogenesis without affecting testosterone secretion?


the _____ has/have no androgen receptors and do not respond to it.

germ cells

testosterone inhibits

gonadotropin-releasing hormone (GnRH) secretion

changes called male climacteric are a consequence of

increased secretion of FSH and LH

this image shows spermatogenesis. What does "3" represent?

secondary spermatocyte

in the process of spermiogenesis, ____ become _____.

spermatids; spermatoza

in meiosis, each parent cell produces

four haploid cells

in spermatogenesis, only the final cells are called ____, but they and all the stages leading up to them can be called

gamete; germ cells

at the end of meiosis I there are _____, whereas at the end of meiosis II there is/are _____.

two haploid cells; four haploid cells

the most important role of meiosis in sexual reproduction is

that it prevents the chromosome number from doubling in each generation

at what stage does a developing sperm cell begin to grow a tail?


sperm cells get energy to power heir movement from _____ contributed by the ____.

fructose; seminal vesicles

male infertility (sterility) refers to

the inability to fertilize an egg

the acrosome contains enzymes used to

penetrate the egg

_____ have 46 chromosomes, whereas _____ have 23.

primary spermatocytes; spermatids

a sperm count any lower than ____ million sperm per mL of semen is usually associated with infertility (sterility)

20 to 25

dilation of the ____ causes the lacunae to fill with blood and the penis to become erect.

deep arteries

the orgasm-emission phase of the male sexual response is stimulated by

efferent sympathetic signals from the lumbar region of the spinal cord

erection is

an autonomic reflex mediated predominantly by parasympathetic nerve fibers

heart rate, blood pressure, and respiratory rate peak during the

climax (orgasm)

sidlenafil (viagra) prolongs erection by

inhibiting degradation of cGMP

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