In males, which structure is responsible for producing semen?

Correct Answer: A

Rationale: The correct answer is A: Seminal vesicles. Seminal vesicles are responsible for producing the majority of the fluid in semen, contributing to sperm motility and viability. The other choices are incorrect because: B: Epididymis stores and transports sperm; C: Testes produce sperm; D: Vas deferens transports sperm from the epididymis to the urethra.

Correct Answer: B

Rationale: The correct answer is B: hCG. Human Chorionic Gonadotropin (hCG) is produced by the placenta during pregnancy to support the corpus luteum in producing progesterone, which is essential for maintaining the pregnancy. Prolactin (A) is produced by the pituitary gland and stimulates milk production. FSH (C) is a hormone released by the pituitary gland to stimulate egg production in females. Progesterone (D) is produced by the corpus luteum and later by the placenta during pregnancy to support the uterine lining.

Correct Answer: C

Rationale: The correct answer is C: Transport eggs from the ovary to the uterus. The uterine tube, also known as the fallopian tube, is responsible for capturing the released egg from the ovary and transporting it to the uterus for potential fertilization. This transportation process is essential for successful reproduction. Storing eggs (choice A) is not the function of the uterine tube. Estrogen secretion (choice B) is primarily carried out by the ovaries and other endocrine glands, not the uterine tube. Supporting implantation of the fertilized egg (choice D) is the role of the uterus, not the uterine tube.

Correct Answer: C

Rationale: The correct answer is C because the bulbourethral glands secrete a clear fluid that helps to lubricate the urethra, making it easier for sperm to pass through during ejaculation. This lubrication also helps to neutralize any acidic urine residue in the urethra. Choice A is incorrect because sperm is produced in the testes, not the bulbourethral glands. Choice B is incorrect because semen is a mixture of sperm and seminal fluid produced by other glands such as the prostate and seminal vesicles, not the bulbourethral glands. Choice D is incorrect because the production of testosterone is primarily regulated by the hypothalamus and pituitary gland, not the bulbourethral glands.

Correct Answer: B

Rationale: The correct answer is B: Secrete seminal fluid. The prostate gland secretes a milky, alkaline fluid that makes up a significant portion of semen. This fluid helps nourish and protect sperm, aiding in their motility and fertility. The other choices are incorrect because: A: The production of sperm primarily occurs in the testes. C: Testosterone is mainly produced by the testes and adrenal glands, not the prostate gland. D: Sperm transportation is facilitated by the vas deferens, not the prostate gland.