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Chapter 27

44 Questions
Chapter 27
Questions and Answers
  • 1. 
    ___ is/are generally accepted as a secondary sex characteristic.
    • A. 

      The enlargement of breasts

    • B. 

      The presence of testes

    • C. 

      The prostrate gland

    • D. 

      The vagina

    • E. 

      The uterus

  • 2. 
    Which of the following are primary sex organs?
    • A. 

      Ova

    • B. 

      Uterine tubes

    • C. 

      Breasts

    • D. 

      Ovaries

    • E. 

      Scent glands

  • 3. 
    Which of the following is a secondary sex organ?
    • A. 

      Testis

    • B. 

      Ovary

    • C. 

      Vagina

    • D. 

      Facial hair

    • E. 

      Distribution of body fat

  • 4. 
    Gonads begin to develop
    • A. 

      2 to 3 weeks after fertilization

    • B. 

      5 to 6 weeks after fertilization

    • C. 

      8 to 9 weeks after fertilization

    • D. 

      20 to 24 weeks after fertilization

    • E. 

      At birth

  • 5. 
    ___ determine/s wether an organism will be genetically male or female.
    • A. 

      Hormonal, genetic and environmental factors

    • B. 

      Prenatal hormone exposure

    • C. 

      The egg

    • D. 

      The sperm

    • E. 

      Both egg and sperm equally

  • 6. 
    The gene that codes for the testis-determining factor (TDF) is found in or on
    • A. 

      The Y chromosome

    • B. 

      The X chromosome

    • C. 

      The gonadal ridges

    • D. 

      The fetal testes

    • E. 

      The mesonephros

  • 7. 
    The penis is homologous to
    • A. 

      The appendix

    • B. 

      A finger

    • C. 

      The urethra

    • D. 

      The vagina

    • E. 

      The clitoris

  • 8. 
    The ___ is the gonad and the ___ is the gamete
    • A. 

      Testis;ovary

    • B. 

      Testis;semen

    • C. 

      Testis;sperm

    • D. 

      Sperm;semen

    • E. 

      Semen;sperm

  • 9. 
    ___ stimulates the descent of the testes.
    • A. 

      The presence of the Y chromosome

    • B. 

      The presence of the X chromosome

    • C. 

      The absence of the X chromosome

    • D. 

      Testosterone

    • E. 

      Estrogens

  • 10. 
    The ___ is an example of the female external genitalia.
    • A. 

      Scrotum

    • B. 

      Clitoris

    • C. 

      Uterine tube

    • D. 

      Seminal vesicle

    • E. 

      Vagina

  • 11. 
    From the formation to ejaculation, sperm cells take the following pathway:
    • A. 

      Seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus derferens

    • B. 

      Seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus derferens, urethra

    • C. 

      Seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra

    • D. 

      Seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens

  • 12. 
    When it is cold, the ___ contracts and draws the testes closer to the body to keep them warm.
    • A. 

      Cremaster muscle

    • B. 

      Pampiniform plexus

    • C. 

      Corpus spongiosum

    • D. 

      Perinium

    • E. 

      Corpus cavernosum

  • 13. 
    The countercurrent heat exchanger that prevents arterial blood from overheating the testes is
    • A. 

      The rete testis

    • B. 

      The epididymis

    • C. 

      The pampiniform plexus

    • D. 

      The blood-testis barrier

    • E. 

      The scrotal portal system

  • 14. 
    The blood-testis barrier
    • A. 

      Prevents antibodies in the blood from getting to the germ cells

    • B. 

      Prevents heat loss from the testes

    • C. 

      Prevents blood from getting to the testes

    • D. 

      Maintains testis temperature at 35*C

    • E. 

      Maintains testis temperature at 37*C

  • 15. 
    By volume, most of the semen is produced in the
    • A. 

      Testes

    • B. 

      Penis

    • C. 

      Prostrate gland

    • D. 

      Seminal vesicles

    • E. 

      Bulbourethral glands

  • 16. 
    ___ are not found in the seminiferous tubules.
    • A. 

      Interstitial (Leydig) cells

    • B. 

      Germ cells

    • C. 

      Sustentacular (Sertoli) cells

    • D. 

      Spermatids

    • E. 

      Corpus cavernosum cells

  • 17. 
    The penile urethra is enclosed by the
    • A. 

      Corpus cavernosum

    • B. 

      Corpus spongiosum

    • C. 

      Trabecular muscle

    • D. 

      Prepuce

    • E. 

      Frenulum

  • 18. 
    Men have only ___ but have two of all the rest of these
    • A. 

      Bulbourethral gland(s)

    • B. 

      Prostrate gland(s)

    • C. 

      Ejaculatory duct(s)

    • D. 

      Seminal vesicle(s)

    • E. 

      Corpus(ora) cavernosum(a)

  • 19. 
    Why would an enlarged prostrate interfere with urination?
    • A. 

      It inhibits urine production

    • B. 

      It develops calcified deposits that block the urethra

    • C. 

      It produces thicker prostatic secretions that block the urethra

    • D. 

      It inhibits the micturition reflex

    • E. 

      It compresses the urethra

  • 20. 
    The ___ is/are the site(s) of sperm maturation and storage.
    • A. 

      Seminiferous tubules

    • B. 

      Rete testis

    • C. 

      Prostrate

    • D. 

      Epididymides

    • E. 

      Seminal vesicles

  • 21. 
    All of the following play a role in thermoregulation of the testes except
    • A. 

      Bulbospongiosus muscle

    • B. 

      The cremaster muscle

    • C. 

      The pampiniform plexus

    • D. 

      The countercurrent heat exchanger

    • E. 

      The dartos muscle

  • 22. 
    When do the testes start secreting testosterone?
    • A. 

      In the first trimester of fetal development

    • B. 

      In the first trimester after birth

    • C. 

      In the first three years after birth

    • D. 

      In the first three years of adolescense

    • E. 

      After the first ejaculation

  • 23. 
    Which of the following hormones directly stimulates the development of male secondary sex characteristics?
    • A. 

      Estrogen

    • B. 

      Inhibin

    • C. 

      Luteinizing hormone

    • D. 

      Follicle stimulating hormone

    • E. 

      Testosterone

  • 24. 
    Which of the following is an androgen?
    • A. 

      Estrogen

    • B. 

      Progesterone

    • C. 

      Testosterone

    • D. 

      Luteinizing hormone (LH)

    • E. 

      Follicle-stimulating hormone (FSH)

  • 25. 
    ___ stimulates the interstitial cells of the testes to secrete ___
    • A. 

      Gonadotropin-releasing hormone (GnRH); LH

    • B. 

      Follicle-stimulating hormone (FSH); androgen-binding protein (ABP)

    • C. 

      Luteinizing hormone (LH);androgen-binding protein (ABP)

    • D. 

      Luteinizing hormone (LH); testosterone

    • E. 

      Luteinizing hormone (LH); estrogen

  • 26. 
    The ___ has/have no androgen receptors and do not respond to it.
    • A. 

      Germ cells

    • B. 

      Muscular tissue

    • C. 

      Sustentacular cells

    • D. 

      Hypothalmus

    • E. 

      Pituitary gland

  • 27. 
    Testosterone inhibits
    • A. 

      Libido

    • B. 

      Development of secondary sex organs

    • C. 

      Development of secondary sex characteristics

    • D. 

      Gonadotropin-releasing hormone (GnRH) secretion

    • E. 

      Sperm production

  • 28. 
    Changes called male climacteric are a consequence of
    • A. 

      Increased secretion of estrogens

    • B. 

      Increased secretion of progesterone

    • C. 

      Increased secretion of testosterone

    • D. 

      Increased secretion of FSH and LH

    • E. 

      Increased secretion of GnRH

  • 29. 
    In the process of spermiogenesis, ___ become ___
    • A. 

      Spermatocytes; spermatozoa

    • B. 

      Spermatozoa; spermatids

    • C. 

      Spermatogonia; spermatocytes

    • D. 

      Spermatocytes; spermatids

    • E. 

      Spermatids; spermatozoa

  • 30. 
    In meiosis, each parent cell produces
    • A. 

      Two haploid cells

    • B. 

      Four haploid cells

    • C. 

      Two diploid cells

    • D. 

      Four diploid cells

    • E. 

      Haploid cells identical to the parent cell

  • 31. 
    In spermatogenesis, only the final cells are called ___, but they and all the stages leading up to them can be called ___
    • A. 

      Sperm cells; interstituial cells

    • B. 

      Sperm cells; sustentacular cells

    • C. 

      Secondary spermatocytes; spermatocytes in general

    • D. 

      Secondary spermatocytes; germ cells

    • E. 

      Gametes; germ cells

  • 32. 
    At the end of meiosis I there are ___, whereas at the end of meiosis II there is/are ___
    • A. 

      Two diploid cells; one diploid cell

    • B. 

      Two diploid cells; one haploid cell

    • C. 

      Two diploid cells; for haploid cells

    • D. 

      Two haploid cells; four haploid cells

    • E. 

      Two haploid cells; one diploid cell

  • 33. 
    The most important role of meiosis in sexual reproduction is
    • A. 

      That it reduces the size of gametes

    • B. 

      That it produces at least one gamete that is mobile

    • C. 

      That it prevents the chromosome number from doubling in each generation

    • D. 

      That it ensures that each daughter cell doubles the number of chromosomes

    • E. 

      That it changes the genetic compostion of each chromosome

  • 34. 
    At what stage does a developing sperm cell begin to grow a tail?
    • A. 

      Spermatozoon

    • B. 

      Spermatid

    • C. 

      Primary spermatocyte

    • D. 

      Secondary spermatocyte

    • E. 

      Spermatogonium

  • 35. 
    Sperm cells get energy to power their movement from ___ contributed by the ___
    • A. 

      Prostaglandins; prostrate gland

    • B. 

      Sucrose; bulbourethral gland

    • C. 

      Fructose; seminal vesicle

    • D. 

      Seminogelin; prostrate gland

    • E. 

      Semen; seminiferous gland

  • 36. 
    Male infertility (sterility) refers to
    • A. 

      The inability to fertilize an egg

    • B. 

      Low sperm count

    • C. 

      A lack of seminal fluid during ejaculation

    • D. 

      Low levels of testosterone

    • E. 

      The inability to have an erection

  • 37. 
    The acrosome contains enzymes used to
    • A. 

      Dissolve the mucosa of the vagina

    • B. 

      Dissolve the mucosa of the uterus

    • C. 

      Dissolve the stickiness of the semen

    • D. 

      Penetrate the vagina

    • E. 

      Penetrate the egg

  • 38. 
    ___ have 46 chromosomes, where as ___ have 23.
    • A. 

      Spermatids; spermatozoa

    • B. 

      Primary spermatocytes; spermatids

    • C. 

      Secondary spermatocytes

    • D. 

      Spermatogonia, primary spermatocytes

    • E. 

      Type A spermatogonia; type B spermatogonia

  • 39. 
    A sperm count any lower than ___ million sperm per mL of semen is usually associated with infertility (sterility).
    • A. 

      250 to 500

    • B. 

      200 to 250

    • C. 

      100 to 200

    • D. 

      50 to 100

    • E. 

      20 to 25

  • 40. 
    Dilation of the ___ causes lacunae to fill with blood and the penis to become erect.
    • A. 

      Helicine arteries

    • B. 

      Internal pudendal (penile) arteries

    • C. 

      Dorsal arteries

    • D. 

      Dorsal veins

    • E. 

      Deep arteries

  • 41. 
    The orgasm-emission phase of the male sexual response is stimulated by
    • A. 

      Efferent sympathetic signals from the sacral region of the spinal cord

    • B. 

      Efferent sympathetic signals from the lumbar region of the spinal cord

    • C. 

      Efferent parasympathetic signals from the sacral region of the spinal cord

    • D. 

      Efferent parasympathetic signals from the lumbar region of the spinal cord

    • E. 

      Efferent somatic signals from the thoracic region of the spinal cord.

  • 42. 
    Erection is
    • A. 

      An autonomic reflex mediated predominantly by parasympathetic nerve fibers

    • B. 

      An autonomic reflex mediated predominantly by sympathetic nerve fibers

    • C. 

      A somatic reflex mediated predominantly by parasympathetic nerve fibers

    • D. 

      A somatic reflex mediated predominantly by sympathetic nerve fibers

    • E. 

      An exclusively voluntary action mediated by the cortex

  • 43. 
    Heart rate, blood pressure, and respiratory rate peak during the
    • A. 

      Excitement phase

    • B. 

      Erection of the penis

    • C. 

      Climax (orgasm)

    • D. 

      Plateau phase

    • E. 

      Resolution phase

  • 44. 
    Sildenafil (Viagra) prolongs erection by
    • A. 

      Activating nitric oxide (NO) production

    • B. 

      Inactivating guanylate cyclase

    • C. 

      Stimulating production of cGMP

    • D. 

      Inhibiting degradation of cGMP

    • E. 

      Inhibiting nitric oxide (NO) production

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