What hormone regulates the production of sperm in males?

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: 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.

Correct Answer: C

Rationale: Rationale: 1. The menstrual phase is the phase where the uterine lining sheds. 2. This occurs when there is no pregnancy and the hormone levels drop. 3. Shedding of the lining leads to menstrual bleeding. 4. The follicular phase is characterized by follicle development. 5. The luteal phase follows ovulation and prepares the uterus for a potential pregnancy. 6. Ovulation refers to the release of the egg from the ovary, not shedding of the uterine lining. Summary: - A: Follicular phase - Incorrect, focuses on follicle development. - B: Luteal phase - Incorrect, prepares the uterus for potential pregnancy. - C: Menstrual phase - Correct, characterized by shedding of uterine lining. - D: Ovulation phase - Incorrect, refers to the release of the egg.

Correct Answer: A

Rationale: The correct answer is A: Synthesize testosterone. Interstitial cells in the testes, also known as Leydig cells, are responsible for producing testosterone, the primary male sex hormone. Testosterone plays a crucial role in the development of male reproductive organs, secondary sexual characteristics, and overall reproductive function. The other choices are incorrect because storing sperm (B) is the role of the epididymis, producing seminal fluid (C) is the role of the seminal vesicles, and maturing sperm (D) occurs in the seminiferous tubules through the process of spermatogenesis.