BIOS 131 Chap 27

38 Questions | Total Attempts: 83

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BIOS 131 Chap 27

Bios 131 spring 2010 chapter 27 final


Questions and Answers
  • 1. 
    The ductus deferens develops from the ____ of the embryo
    • A. 

      Mesonephric duct

    • B. 

      Paramesonephric duct

    • C. 

      Phallus

    • D. 

      Labioscrotal folds

    • E. 

      Urogenital folds

  • 2. 
    The protein that clots and causes the stickiness of the semen is
    • A. 

      Seminogelin

    • B. 

      Prostaglandin

    • C. 

      Fibrin

    • D. 

      Phosphodiesterase

    • E. 

      Serine protease

  • 3. 
    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

  • 4. 
    Prior to ejaculation, sperm are stored primarily in
    • A. 

      The seminiferous tubules

    • B. 

      The rete testis

    • C. 

      The epididymis

    • D. 

      The seminal vesicles

    • E. 

      The ejaculatory ducts

  • 5. 
    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 bulbospongiosus

    • E. 

      The ischiocavernosus

  • 6. 
    The first hormone secreted at the onset of puberty is
    • A. 

      Follicle-stimulation hormone

    • B. 

      Interstitial cell-stimulating hormone

    • C. 

      Human chorionic gonadotropin

    • D. 

      Gonadotropin-releasing hormone

    • E. 

      Testosterone

  • 7. 
    When it is 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

  • 8. 
    Four spermatozoa arise from each
    • A. 

      Primordial germ cell

    • B. 

      Type A spermatogonium

    • C. 

      Type B spermatogonium

    • D. 

      Secondary spermatocyte

    • E. 

      Spermatid

  • 9. 
    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

  • 10. 
    Blood is forced out of the penile lacunae by contraction of the _____ muscles.
    • A. 

      Bulbospongiosus

    • B. 

      Ischiocavernosus

    • C. 

      Cremaster

    • D. 

      Trabecular

    • E. 

      Dartos

  • 11. 
    Under the influence of androgens, the embryonic _____ duct develops into the male reproductive tract.
  • 12. 
    Spermatozoa obtain energy for locomotion from ______ in the semen.
  • 13. 
    The ________, a network of veins in the spermatic cord, helps keep the testes cooler than the core body temperature.
  • 14. 
    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.
  • 15. 
    The corpora cavernosa as well as the testes have a fibrous capsule called the ______.
  • 16. 
    Over half of the semen consists of secretions from a pair of glands called the ______.
  • 17. 
    The blood-testis barrier is formed by tight junctions between the _____ cells.
  • 18. 
    The earliest haploid stage of spermatogenesis is the ______.
  • 19. 
    Erection of the penis occurs when nitric oxide causes the ______ arteries to dilate.
  • 20. 
    A sperm penetrates the egg by means of enzymes in its ______.
  • 21. 
    True or False: The male scrotum is homologous to the female labia majora
    • A. 

      True

    • B. 

      False

  • 22. 
    True or False: Sperm cannot develop at the core body temperature
    • A. 

      True

    • B. 

      False

  • 23. 
    True or False: Luteinizing hormone stimulates the testes to secrete testosterone.
    • A. 

      True

    • B. 

      False

  • 24. 
    True or False: The testes and penis are the primary sex organs of the male.
    • A. 

      True

    • B. 

      False

  • 25. 
    True or False: A high testosterone level makes a fetus develop a male reproductive system, and a high estrogen level makes it develop a female reproductive system.
    • A. 

      True

    • B. 

      False

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