Question 1
Choose one INCORRECT statement regarding the blood-testis barrier.
Choices:
- It controls the composition of the cytoplasm of sustentacular (Sertoli) cells.
- It separates the basal from the adluminal comparments.
- Structurally, it consists of tight junctions between adjacent sustentacular cells.
- It shields maturing sperm from the immune system.
Answers:
- It controls the composition of the cytoplasm of sustentacular (Sertoli) cells.
Comments:
- Correct
- That's right! The blood-testis barrier does NOT control the cytoplasm of the sustentacular cells.
- Continue
Question 2
Choose one INCORRECT statement regarding spermatogenesis.
Choices:
- Spermatogonia are haploid cells produced only after puberty.
- The blood-testis barrier protects maturing sperm from detection by the immune system.
- The most immature spermatogenic cells of the seminiferous tubule epithelium are adjacent to the basement membrane.
- Mitotic divisions that occur at the beginning of spermatogenesis maintain the stem cell population.
Answers:
- Spermatogonia are haploid cells produced only after puberty.
Comments:
- Correct
- That's right! Spermatogonia are diploid cells and they develop prenatally.
- Continue
Question 3
During spermiogenesis, what structure forms from the Golgi complex of the spermatid?
Choices:
- the acrosome
- a residual body
- the axoneme of the flagellum
- the midpiece
Answers:
- the acrosome
Comments:
- Correct
- That's right! The Golgi apparatus forms proacrosomal vesicles, which coalesce to form an acrosomal cap on the nucleus.
- Continue
Question 4
Which of the following cell types is the LEAST differentiated?
Choices:
- spermatogonia
- interstitial (Leydig) cells
- sustentacular (Sertoli) cells
- primary spermatocytes
Answers:
- spermatogonia
Comments:
- Correct
- That's right! Spermatogonia are stem cells that develop prenatally.
- Continue
Question 5
Identify A.
Choices:
- Tunica albuginea
Answers:
- Tunica albuginea
Comments:
- Correct
- That's right! The tunica albuginea surrounds the testicle. It consists of dense connective tissue and its high proportion of collagen fibres make it stain bright pink with eosin.
- Continue
Question 6
Identify B.
Choices:
- Seminiferous tubules
- Seminiferous tubule
Answers:
- Seminiferous tubules
- Seminiferous tubule
Comments:
- Correct
- That's right! The seminiferous tubules are seen deep to the tunica albuginea of the testicle. Because they are so tortuous, they are cut many times in a single section.
- Continue
Question 7
Identify the cells indicated. Be specific.
Choices:
- Interstitial (Leydig) Cells
- Leydig Cells
- Leydig cell
- Interstitial (Leydig) Cell
- Interstitial Cell
- Interstitial Cells
- interstitial
Answers:
- Interstitial (Leydig) Cells
- Leydig Cells
- Leydig cell
- Interstitial (Leydig) Cell
- Interstitial Cell
- Interstitial Cells
- interstitial
Comments:
- Correct
- That's right! Interstitial (Leydig) cells are located between the seminiferous tubules.
- Continue
Question 8
What hormone are these cells responsible for producing?
Choices:
- Testosterone
Answers:
- Testosterone
Comments:
- Correct
- That's right! Leydig cells produce testosterone.
- Continue
Question 9
Identify cell type A.
Choices:
- Sertoli cells
- Sertoli cell
- Sertoli
- sustentacular
- sustentacular cells
- sustentacular cell
Answers:
- Sertoli cells
- Sertoli cell
- Sertoli
- sustentacular
- sustentacular cells
- sustentacular cell
Comments:
- Correct
- That's right! The nuclei of sustentacular (Sertoli) cells are paler and more oval than those of the adjacent spermatogonia.
- Continue
Question 10
Identify cell type B.
Choices:
- Spermatogonia
- Type A spermatogonia
- Type B spermatogonia
Answers:
- Spermatogonia
- Type A spermatogonia
- Type B spermatogonia
Comments:
- Correct
- That's right! Spermatogonia occupy the basal compartment of the seminiferous tubules.
- Continue
Question 11
Identify cell type C. Be specific.
Choices:
- early spermatid
- early spermatids
Answers:
- early spermatid
- early spermatids
Comments:
- Correct
- That's right! Primary spermatocytes are small, round cells found in the adluminal compartment.
- Continue
Question 12
Identify cell type D. Be specific.
Choices:
- Late spermatids
- Late spermatid
- Spermatids
- Spermatid
Answers:
- Late spermatids
- Late spermatid
- Spermatids
- Spermatid
Comments:
- Correct
- That's right! Late spermatids take on the morphology of mature sperm cells, with a head, neck-piece and flagellum.
- Continue