chapter 27- Male Reproductive System
Terms
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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
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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
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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
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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
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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
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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
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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 - inhibin
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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
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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
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Blood is forced out of the penile lacunae by contraction of the______muscles
a. bulbocavernosus
b. ischiocavernosus
c. cremaster
d. trabecular
e. dartos - trabecular
- Under the influence of androgens, the embryonic______duct develops into the male reproductive tract.
- mesonephric
- Spermatozoa obtain energy for locomotion from_____in the semen
- fructose
- 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.
- sustentacular
- The earliest haploid stage of spermatogenesis is the______.
- secondary spermatocyte
- Erection of the penis occurs when nitric oxide causes the_____arteries to dilate.
- deep
- A sperm penetrates the egg by means of enzymes in its______.
- aerosome
- T/F The male scrotum is homologous to the female labis majora.
- True
- T/F Sperm cannot develop at the core body temperature.
- True
- T/F Luteinizing hormone stimulates the testes to secrete testosterone.
- True
- 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.
- True
- 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.
- True