Which of the following hormone stimulates the development of corpus luteum?

Correct Answer: C

Rationale: The correct answer is C: Luteinizing hormone (LH). LH is responsible for stimulating the development of the corpus luteum after ovulation. It triggers the release of the egg from the follicle and promotes the transformation of the follicle into the corpus luteum, which is crucial for the production of progesterone. Estrogen (A) is involved in the development of the follicle, not the corpus luteum. Progesterone (B) is produced by the corpus luteum, not responsible for its development. FSH (D) is primarily involved in stimulating the growth of ovarian follicles, not the formation of the corpus luteum.

Correct Answer: D

Rationale: Estrogen is known to stimulate ductal proliferation in the breast tissue as part of its role in breast development and maintenance. This is crucial for preparing the breast for potential pregnancy and lactation. The other choices are incorrect because estrogen does not directly cause cystic changes in the vagina, alter the pH of cervical mucus to become more alkaline, or specifically facilitate the growth of ovarian follicles. Estrogen plays a role in ovarian follicle development, but its main function in this context is to stimulate the growth and maturation of the follicles, not just facilitate their growth.

Correct Answer: C

Rationale: The correct answer is C: Bleeding from the vagina. This finding is concerning in a postmenopausal woman as it could indicate underlying serious conditions such as endometrial cancer. Immediate action is needed to investigate the cause and provide appropriate care. A: Vaginal dryness is common in postmenopausal women and can be managed with lubricants or hormone therapy. B: Not having a Pap test for 3 years is important for cervical cancer screening but does not require immediate action. D: Leakage of urine, while a concern, does not require immediate action as it is not directly related to a potentially life-threatening condition.

Correct Answer: B

Rationale: The correct answer is B: seminiferous tubules. Testicular cancer arises from the cells within the seminiferous tubules where sperm production occurs. These tubules are the most common site for testicular cancer to develop. The other choices are incorrect because testicular cancer typically does not originate from the scrotal sac (A), epididymis (C), or interstitial cells (D). The scrotal sac contains the testicles but does not produce cancer, the epididymis is a different structure involved in sperm maturation, and interstitial cells produce hormones rather than sperm.

Correct Answer: D

Rationale: The correct answer is D: blood leaves erectile tissue. During penile erection, blood flows into the erectile tissue, causing the penis to become erect. Parasympathetic stimulation and arterial dilation are essential for promoting blood flow into the penis, while venous compression helps to trap blood within the erectile tissue, sustaining the erection. However, if blood were to leave the erectile tissue, it would result in a loss of erection. Therefore, choice D is not compatible with penile erection.