Review Practice Questions 3

The Male Reproductive System > Maternal Newborn

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Practice Questions 3

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Total Questions : 5

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Question 1:

Which hormone stimulates Leydig cells to produce testosterone?

A. FSH B. LH C. GnRH D. Inhibin

Answer and Explanation

Choice A:

Follicle-stimulating hormone (FSH) acts on Sertoli cells to support spermatogenesis and produce androgen-binding protein, not testosterone.

Choice B:

LH directly stimulates Leydig cells to synthesize testosterone, which supports spermatogenesis and male secondary sexual characteristics.Rationale for incorrect answers

Choice C:

GnRH from the hypothalamus regulates the anterior pituitary release of LH and FSH but does not act directly on Leydig cells.

Choice D:

Inhibin, produced by Sertoli cells, selectively inhibits FSH secretion from the anterior pituitary, with no role in testosterone synthesis.

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Question 2:

Select all correct steps in spermatogenesis.

A. Mitosis of spermatogonia B. Formation of spermatids C. Ovulation D. Meiosis I and II E. Fertilization

Answer and Explanation

Choice A:

Mitosis of spermatogonia produces primary spermatocytes, maintaining the germ cell pool and initiating spermatogenesis.

Choice B:

Formation of spermatids occurs after meiosis II, producing haploid cells ready for morphological maturation into spermatozoa.

Choice C:

Ovulation is the release of an oocyte from the ovary in females and is not part of spermatogenesis.

Choice D:

Meiosis I reduces chromosome number from diploid to haploid, while meiosis II separates sister chromatids, essential for genetic diversity.Rationale for incorrect answers

Choice E:

Fertilization is the fusion of a sperm cell with an oocyte to form a zygote, occurring after spermatogenesis is complete.

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Question 3:

Which hormone provides negative feedback to inhibit FSH secretion?

A. Testosterone B. Inhibin C. LH D. GnRH

Answer and Explanation

Choice A:

Testosterone primarily inhibits GnRH and LH secretion via negative feedback to the hypothalamus and pituitary, not selective FSH suppression.

Choice B:

Inhibin acts directly on the anterior pituitary to reduce FSH release, thus controlling Sertoli cell stimulation and spermatogenesis rate.Rationale for incorrect answers

Choice C:

LH stimulates Leydig cells to produce testosterone and is not a negative feedback hormone.

Choice D:

GnRH stimulates the release of both FSH and LH and is not involved in negative feedback inhibition.

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Question 4:

Spermiogenesis refers to:

A. The division of spermatogonia B. The maturation of spermatids into spermatozoa C. The release of sperm into the epididymis D. The fusion of sperm with the ovum

Answer and Explanation

Choice A:

Division of spermatogonia occurs in the mitotic phase of spermatogenesis, before meiosis, not during spermiogenesis.

Choice B:

Spermiogenesis transforms non-motile spermatids into structurally mature spermatozoa with specialized morphology for fertilization, without changing chromosome number.Rationale for incorrect answers

Choice C:

Release of sperm into the epididymis is spermiation, which follows spermiogenesis but is a distinct process.

Choice D:

Fusion of sperm with the ovum is fertilization, occurring in the female reproductive tract after ejaculation.

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Question 5:

Which structure is the site of spermatogenesis?

A. Rete testis B. Seminiferous tubules C. Vas deferens D. Epididymis

Answer and Explanation

Choice A:

The rete testis is a network of channels that collect sperm from seminiferous tubules and transport them to the efferent ductules; no spermatogenesis occurs here.

Choice B:

Seminiferous tubules are the exclusive site of sperm production, containing the complete microenvironment for germ cell development under hormonal regulation by FSH and testosterone.Rationale for incorrect answers

Choice C:

The vas deferens transports mature sperm from the epididymis to the ejaculatory ducts during ejaculation; it is not a site of sperm production.

Choice D:

The epididymis stores and matures sperm but does not produce them.

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Practice Questions 3

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