What is the function of the uterine lining during 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: 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.

Correct Answer: C

Rationale: The correct answer is C: Epididymis. The epididymis is a coiled tube located on top of the testes where sperm are stored after production. It allows for maturation and storage of sperm before they are ejaculated. The other choices, A: Seminal vesicle, B: Vas deferens, and D: Prostate gland, do not store sperm. The seminal vesicle produces seminal fluid, the vas deferens transports sperm from the testes to the urethra, and the prostate gland secretes fluid that nourishes and protects sperm. Therefore, the epididymis is the correct choice as it specifically stores sperm after production.

Correct Answer: A

Rationale: Estrogen is the correct answer because it increases the permeability of the cervix to sperm during ovulation. Estrogen is responsible for the changes in cervical mucus consistency, making it easier for sperm to swim through to reach the egg. Progesterone, FSH, and LH do not directly affect cervical mucus permeability during ovulation. Progesterone prepares the uterine lining for implantation, FSH stimulates follicle growth, and LH triggers ovulation.