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chapter 27- Male Reproductive System


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The ductus deferens develops from the_____of the embryo.
a. mesonephric duct
b. paramesonephric duct
c. phallus
d. labioscrotal folds
e. urogenital folds
mesonephric duct
Decent of the testes is achieved by contraction of a cord called
a. the gubernaculum
b. the spermatic cord
c. the ductus deferens
d. the pampiniform plexus
e. the rete testis
the gubernaculum
The expulsion of semen occurs when the bulbospongiosus muscle is stimulated by
a. somatic efferent neurons
b. somatic afferent neurons
c. sympathetic efferent neurons
d. parasympathetic efferent neurons
e. prostaglandins
somatic efferent neurons
Prior to ejaculation, sperm are stored primarily in
a. the sminiferous tubules
b. the rete testis
c. the epididymis
d. the sminal vesicles
e. the ejaculatory ducts
the epididymis
The penis is attached to the pubic arch by crura of
a. the corpora cavernosa
b. the corpus spongiosum
c. the perineal membrane
d. the bulbocavernosus
e. the ischiocavernosus
the corpora cavernosa
The first hormone secreted at the onset of puberty is
a. follicle-stimulating hormone
b. interstitial cell-stimulating hormone
c. human chorionic gonadotropin
d. gonadotropin releasing hormone
e. testosterone
gonadotropin-releasing hormone
When is it necessary to reduce sperm production without reducing testosterone secretion, the sustentacular cells secrete
a. dihydrotestosterone
b. androgen-binding protein
c. LH
d. FSH
e. inhibin
Four spermatozoa arise from each
a. primordial germ cell
b. type A spermatogonium
c. type B spermatogonium
d. secondary spermatocyte
e. spermatid
type B spermatogonium
The point in meiosis at which sister chromatids separate from each other is
a. prophase I
b. metaphase I
c. anaphase I
d. anaphase II
e. telophase II
anaphase II
Blood is forced out of the penile lacunae by contraction of the______muscles
a. bulbocavernosus
b. ischiocavernosus
c. cremaster
d. trabecular
e. dartos
Under the influence of androgens, the embryonic______duct develops into the male reproductive tract.
Spermatozoa obtain energy for locomotion from_____in the semen
The_______, a network of veins in the spermatic cord, helps keep the testes cooler than the core body temperature.
panpiniform plexus
All germ cells beginning with the_______are genetically different from the rest of the body cells and therefore must be protected by the blood-testis barrier.
second spermatocytes
The corpora cavernosa as well as the testes have a fibrous capsule called the______.
tunica albuginea
Over half of the semen consits of secretions from a pair of glands called the______.
seminal vesicles
The blood-testis barrier is formed by tight junctions between the________cells.
The earliest haploid stage of spermatogenesis is the______.
secondary spermatocyte
Erection of the penis occurs when nitric oxide causes the_____arteries to dilate.
A sperm penetrates the egg by means of enzymes in its______.
T/F The male scrotum is homologous to the female labis majora.
T/F Sperm cannot develop at the core body temperature.
T/F Luteinizing hormone stimulates the testes to secrete testosterone.
T/F The testes and penis are the primary sex organs of the male.
False, only the testes are the primary sex organs
T/F A high testosterone level makes a fetus develop a male reproductive system, and a high estrogen level makes it develop a female reproductive system.
False, female development results from a low testosterone level, not from estrogen
T/F Most of the semen is produced by the seminal vesicles.
T/F The pampiniform plexus serves to keep the testes warm.
False, the pampiniform plexus prevents the testes from overheating
T/F Prior to ejaculation, sperm are stored mainly in the seminal vesicles.
False, sperm are stored in the epididymis.
T/F Male menopause is the cessation of sperm production around the age of 55.
False, no such thing as male menopause
T/F Erection is caused by parasympathetic stimulation of the penile arteries.

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