Question 1

Which structure in the male reproductive system is responsible for maintaining a temperature approximately 3°C lower than core body temperature, and why is this temperature important?

Accepted Answer

The scrotum; it is necessary for proper sperm production and development.

Question 2

During meiosis in spermatogenesis, what is the chromosomal number of secondary spermatocytes produced at the end of Meiosis I?

Accepted Answer

$$n$$

Question 3

Which of the following best describes the function of the pampiniform venous plexus in the spermatic cord?

Accepted Answer

It absorbs heat from testicular arteries to keep the testes cool.

Question 4

A patient undergoes a vasectomy. Which structure is cut and ligated, and what is the primary effect on fertility?

Accepted Answer

The vas deferens; sperm cannot reach the urethra.

Question 5

Which of the following events during Prophase I of meiosis increases genetic diversity in gametes?

Accepted Answer

Crossover (chiasmata) between nonsister chromatids

Question 6

Which gland produces a thick, clear mucus that lubricates the glans penis and neutralizes traces of acidic urine in the urethra during sexual arousal?

Accepted Answer

Bulbourethral (Cowper’s) gland

Question 7

A male patient presents with infertility due to immotile sperm. Which region of the sperm is most likely defective?

Accepted Answer

Tail (flagellum)

Question 8

Which of the following is a function of prostaglandins in semen?

Accepted Answer

Decrease viscosity of cervical mucus and stimulate reverse peristalsis in the uterus

Question 9

Which of the following best describes the sequence of sperm movement from the seminiferous tubules to the exterior of the body?

Accepted Answer

Seminiferous tubules → epididymis → vas deferens → ejaculatory duct → urethra

Question 10

Which of the following is TRUE regarding the function of the corpus spongiosum during erection?

Accepted Answer

It prevents the urethra from collapsing, allowing semen to pass through.

Question 11

Which of the following best explains why semen is alkaline?

Accepted Answer

To enhance sperm motility by neutralizing the acidity of the male urethra and female vagina.

Question 12

Which of the following is the correct sequence of events during Meiosis I?

Accepted Answer

Prophase I → Metaphase I → Anaphase I → Telophase I

Question 13

A mutation prevents the formation of the tunica albuginea in the testes. Which of the following is most likely to occur?

Accepted Answer

The testis will lack a fibrous capsule, compromising its structural integrity.

Question 14

Which of the following best describes the role of the interstitial endocrine cells (Leydig cells) in the testes?

Accepted Answer

They produce androgens such as testosterone.

Question 15

Which of the following is a direct result of the sympathetic spinal reflex during ejaculation?

Accepted Answer

Constriction of the bladder sphincter to prevent urine expulsion.

Question 16

Which of the following best explains why sperm contain large numbers of mitochondria in their midpiece?

Accepted Answer

To provide ATP for flagellar movement.

Question 17

Which of the following is a unique event that occurs during Prophase I of meiosis but not during mitosis?

Accepted Answer

Synapsis and crossing over between homologous chromosomes.

Question 18

Which of the following best describes the function of the epididymis?

Accepted Answer

It stores and matures sperm, allowing them to become motile.

Question 19

Which of the following is the correct chromosomal outcome of meiosis II in spermatogenesis?

Accepted Answer

Four haploid ($$n) $$cells, each with unduplicated chromosomes.

Question 20

Which of the following best explains the role of relaxin in semen?

Accepted Answer

It enhances sperm motility.

The Male Reproductive System: Structure, Function, and Spermatogenesis

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