What is the role of the bulbourethral glands in males?

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: C

Rationale: The correct answer is C: FSH (Follicle-Stimulating Hormone) because it stimulates the production of sperm in males by acting on the testes. FSH is produced by the pituitary gland and plays a crucial role in spermatogenesis. Testosterone (A) is important for male sexual characteristics but does not directly regulate sperm production. Estrogen (B) is a female sex hormone. LH (D) is luteinizing hormone, which plays a role in testosterone production and ovulation in females, but not directly in sperm production.

Correct Answer: B

Rationale: Step 1: The corpus luteum is formed from the ruptured follicle after ovulation. Step 2: It secretes progesterone to maintain the endometrium for potential implantation. Step 3: If fertilization doesn't occur, corpus luteum degenerates, leading to menstruation. Step 4: Thus, the correct answer is B, as it plays a crucial role in endometrial maintenance. Summary: A secretes estrogen, C stimulates ovulation, and D stimulates sperm production, which are not the primary functions of the corpus luteum in the menstrual cycle.

Correct Answer: B

Rationale: The correct answer is B: Support implantation of the fertilized egg. During the menstrual cycle, the uterine lining thickens to provide a nourishing environment for a fertilized egg to implant and develop into a fetus. This is crucial for a successful pregnancy. Choice A is incorrect because the uterine lining supports the implantation of the fertilized egg, not fertilization itself. Choice C is incorrect as the role of the uterine lining is not primarily to protect against infection. Choice D is incorrect as the uterine lining's main function is not to assist with labor but rather to support the early stages of pregnancy.

Correct Answer: C

Rationale: The correct function of the vas deferens is to transport sperm from the epididymis to the urethra for ejaculation. This is a crucial step in the male reproductive system for delivering sperm during ejaculation. The other choices are incorrect because: A: The storage of sperm occurs in the epididymis, not the vas deferens. B: Secretion of seminal fluid is the role of the seminal vesicles and prostate gland, not the vas deferens. D: Testosterone production is primarily carried out by the testes, not the vas deferens.