Deck 21: The Malereproductivesystem

Question 1

Which of the following accurately describes spermiogenesis?

A) Occurs before puberty
B) Involves stem cells, meiosis, and spermatogenesis
C) Involves cytodifferentiation of early spermatids
D) Occurs in diploid cells
E) Results in the formation of primary spermatocytes

Answer 1

Involves cytodifferentiation of early spermatids

Question 2

A man with a pituitary gonadotrophic tumor causing hyposecretion of FSH is most likely to exhibit which condition?

A) No symptoms, since he has no ovarian follicles
B) Loss of libido (sex drive)
C) Low serum testosterone levels
D) Low sperm count
E) Prostatic hypertrophy

Answer 2

Low sperm count

Question 3

Interstitial cells of Leydig have an important function in male gamete production. Because of this function, which of the following organelles is abundant within these cells?

A) Lysosomes
B) Smooth endoplasmic reticulum
C) Peroxisomes
D) Polyribosomes
E) Golgi complexes

Answer 3

Smooth endoplasmic reticulum

Question 4

While studying a germ cell line developed from a patient's testicular biopsy, the researcher notes that colchicine-treated cells blocked in metaphase have 46 chromosomes. From which of the following regions of the male genital tract would you expect these cells to have originated?

A) Within the rete testis
B) At the basal lamina of the seminiferous tubule
C) In the middle region of the germinal epithelium
D) Within the adluminal compartment of the seminiferous tubule
E) Within the straight tubules

Question 5

Which of the following organs is normally characterized by the accumulation of corpora amylacea with increasing age?

A) Prostate
B) Seminal vesicles
C) Bulbourethral (Cowper) glands
D) Epididymis
E) Ductus (vas) deferens

Question 6

Within the male reproductive tract, stereocilia project from cells lining which of the following regions?

A) Rete testis
B) Seminiferous tubules
C) Ampulla of the ductus deferens
D) Epididymis
E) Penile urethra

Question 7

As sperm pass through the male genital ducts, proteins and lowmolecular-weight products are added from several sources producing semen. Which of the following provides a nutritive, fructose-rich secretion?

A) Interstitial cells of Leydig
B) Bulbourethral (Cowper) glands
C) Prostate gland
D) Epididymis
E) Seminal vesicles

Question 8

A 20-year-old man contracts cholera during a long tour of military duty in a remote, completely undeveloped region. After a 5-day period of severe diarrhea and treatment, he gradually recovers and slowly returns to work. He is married 3 years later but after a few years of trying to conceive a child, semen analysis reveals that his sperm are few in number and malformed, and blood tests show a high titer of antibodies against sperm antigens. The causative agent of cholera, Vibrio cholera, secretes a toxin that interferes with tight (occluding) junctions. What cells in the gonad are the likely target of this toxin in the male reproductive system?

A) Spermatogonia
B) Sertoli cells
C) Myoid cells
D) Interstitial cells of Leydig
E) Differentiating spermatozoa

Question 9

A 29-year-old man presents with testicular pain and a burning sensation during urination. Tests reveal the presence of Neisseria gonorrhea and penicillin is prescribed. Gonorrhea often produces acute or chronic inflammation of the testes and frequently involves the channels that connect the testis to the epididymis. What is the name of these channels?

A) The mediastinum testis
B) The rete testis
C) Efferent ductules
D) The straight tubules (tubuli recti)
E) The seminiferous tubules

Question 10

A 39-year-old man undergoing an extensive series of tests for infertility is found to have a genetic mutation preventing formation of a functional synaptonemal complex during meiosis, causing almost complete failure of sperm formation. Which cells would be directly affected by this mutation?

A) Primary spermatocytes
B) Spermatogonia
C) Secondary spermatocytes
D) Spermatids
E) Cells undergoing spermiogenesis