Question 1

Which of the following best describes the main function of the scrotum in the male reproductive system?

Accepted Answer

To maintain the testes at a temperature approximately 3°C lower than core body temperature, which is necessary for sperm production

Question 2

Which hormone is released from the hypothalamus and initiates the hormonal cascade that regulates the male reproductive system?

Accepted Answer

Gonadotropin-releasing hormone (GnRH)

Question 3

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

Accepted Answer

It increases genetic variability among gametes

Question 4

A patient presents with a painless, solid mass in the testis. Which condition should be considered, and what is a common risk factor?

Accepted Answer

Testicular cancer; cryptorchidism

Question 5

Which of the following equations correctly represents the reduction in chromosome number during meiosis?

Accepted Answer

$$2n \rightarrow n$$

Question 6

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

Accepted Answer

Epididymis

Question 7

What is the primary role of the androgen-binding protein (ABP) secreted by sustentocytes in the seminiferous tubules?

Accepted Answer

To keep testosterone levels high near spermatogenic cells, promoting spermatogenesis

Question 8

A vasectomy is a surgical procedure that prevents the release of sperm during ejaculation. Which structure is cut and ligated during this procedure?

Accepted Answer

Ductus deferens

Question 9

Which of the following best explains why sperm must be kept separate from the immune system by the blood-testis barrier?

Accepted Answer

Sperm are not formed until puberty and are not recognized as 'self' by the immune system

Question 10

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

Accepted Answer

Secretes a milky, slightly acidic fluid containing enzymes and prostate-specific antigen (PSA)

Question 11

Which of the following best describes the sequence of hormonal regulation in the male reproductive system?

Accepted Answer

GnRH → Anterior pituitary → FSH/LH → Gonads → Sex hormones

Question 12

A 60-year-old male presents with difficulty urinating and frequent urinary tract infections. Which condition is most likely responsible?

Accepted Answer

Benign prostatic hyperplasia

Question 13

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

Accepted Answer

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

Question 14

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 15

Which of the following is a characteristic of semen that enhances sperm motility and survival in the female reproductive tract?

Accepted Answer

It contains prostaglandins that decrease viscosity of cervical mucus and stimulate reverse peristalsis in the uterus

Question 16

A male patient is found to have low sperm count and abnormal sperm morphology. Which of the following environmental factors could contribute to this condition?

Accepted Answer

Exposure to phthalates and pesticides

Question 17

Which of the following best describes the role of the corpus spongiosum during erection?

Accepted Answer

It surrounds the urethra and keeps it open during erection

Question 18

Which of the following best describes the process of spermiogenesis?

Accepted Answer

The transformation of spermatids into motile spermatozoa

Question 19

Which of the following is a correct statement about the feedback regulation of the HPG axis?

Accepted Answer

Inhibin released by sustentocytes inhibits FSH release from the anterior pituitary

Question 20

Which of the following best explains why the testes are located outside the abdominopelvic cavity?

Accepted Answer

To maintain a temperature optimal for sperm production, which is lower than core body temperature

The Male Reproductive System: Structure, Function, and Regulation

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