Question 1

Which hormone is released from the hypothalamus to initiate the hormonal cascade that regulates the male reproductive system, and what is its primary target?

Accepted Answer

Gonadotropin-releasing hormone (GnRH); targets the anterior pituitary

Question 2

During meiosis, what is the significance of crossing over between nonsister chromatids in Prophase I?

Accepted Answer

It increases genetic variability among gametes

Question 3

A patient presents with a painless, solid mass in the testis. Which condition should be most strongly suspected, and what is a major risk factor for this condition?

Accepted Answer

Testicular cancer; cryptorchidism

Question 4

Which of the following best describes the function of the blood-testis barrier formed by sustentocytes?

Accepted Answer

It prevents sperm antigens from escaping into the blood and triggering an immune response

Question 5

Which equation correctly represents the reduction in chromosome number during meiosis?

Accepted Answer

$$2n \rightarrow n$$

Question 6

A vasectomy is a surgical procedure that cuts and ligates which structure, and what is the physiological consequence?

Accepted Answer

Ductus deferens; sperm cannot reach the urethra

Question 7

Which of the following is a direct effect of FSH on the male reproductive system?

Accepted Answer

Stimulates sustentocytes to release androgen-binding protein (ABP)

Question 8

Which structure in the male reproductive system is responsible for storing sperm until ejaculation?

Accepted Answer

Epididymis (tail)

Question 9

Which of the following best explains why the scrotum is located outside the abdominopelvic cavity?

Accepted Answer

To maintain a temperature about 3°C lower than core body temperature, which is necessary for sperm production

Question 10

Which of the following is a key difference between mitosis and meiosis as shown in the diagrams?

Accepted Answer

Meiosis involves two consecutive divisions and results in haploid cells, while mitosis involves one division and results in diploid cells

Question 11

A male patient is found to have low sperm count and reduced testosterone levels. Which hormone deficiency could directly cause both symptoms?

Accepted Answer

Low levels of LH

Question 12

Which of the following is a function of the prostate gland?

Accepted Answer

Secretes a milky, slightly acidic fluid that activates sperm

Question 13

Which of the following best describes the role of androgen-binding protein (ABP) in spermatogenesis?

Accepted Answer

ABP keeps testosterone levels high near spermatogenic cells, promoting spermatogenesis

Question 14

Which of the following events occurs during Anaphase I of meiosis, as shown in the diagrams?

Accepted Answer

Homologous chromosomes are separated and move to opposite poles

Question 15

A 55-year-old male presents with difficulty urinating and frequent urinary tract infections. Which condition is most likely, and what is a common treatment?

Accepted Answer

Benign prostatic hyperplasia; drugs to relax smooth muscle or surgical resection

Question 16

Which of the following is a direct effect of testosterone on the male body?

Accepted Answer

Promotes the development of secondary sex characteristics such as increased muscle mass and deepening of the voice

Question 17

Which of the following best describes the sequence of sperm movement from the site of production to the urethra?

Accepted Answer

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

Question 18

Which of the following is a plausible consequence of a defect in the calcium channels of sperm cells?

Accepted Answer

Impaired sperm motility and reduced fertility

Question 19

Which of the following best explains why meiosis is essential for sexual reproduction?

Accepted Answer

It reduces the chromosome number by half, preventing chromosome doubling in the zygote

Question 20

Which of the following is a function of the bulbourethral glands?

Accepted Answer

Produce a thick, clear mucus that lubricates the glans penis and neutralizes acidic urine in the urethra

The Male Reproductive System: Structure, Function, and Regulation

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