Which hormone is responsible for the thickening of the endometrial lining in preparation for pregnancy?

Correct Answer: A

Rationale: Estrogen is responsible for thickening the endometrial lining during the proliferative phase of the menstrual cycle to prepare for pregnancy. It stimulates the growth and development of the endometrium. Progesterone, not FSH or LH, is responsible for maintaining the endometrial lining after it has been thickened by estrogen. FSH is involved in stimulating the growth of ovarian follicles, while LH triggers ovulation. Therefore, the correct answer is A (Estrogen) as it directly influences the thickening of the endometrial lining for pregnancy preparation.

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.

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.