The epididymis:

Correct Answer: C

Rationale: Step 1: The epididymis is a structure where sperm mature and are stored. Step 2: The deferent duct (vas deferens) carries sperm from the epididymis to the urethra. Step 3: Since the deferent duct crosses the epididymis, choice C is correct. Summary: Choices A, B, and D are incorrect because they do not accurately describe the anatomical relationship between the epididymis and the deferent duct.

Correct Answer: A

Rationale: The correct answer is A: prostate. Testosterone is primarily secreted by the testicular interstitial cells (Leydig cells) in the testes. The seminiferous tubules are responsible for spermatogenesis, not testosterone secretion. Straight tubules are involved in transporting sperm. The prostate gland produces prostatic fluid, not testosterone. Therefore, the prostate is not a structure that secretes testosterone.

Correct Answer: A

Rationale: Step 1: The cortical area of the ovary is the outer layer where follicles develop. Step 2: Primordial follicles are the earliest stage of follicle development, found in the cortex. Step 3: Mature follicles are developed follicles located deeper in the ovary, not in the cortex. Step 4: Secondary follicles are also more developed than primordial follicles, located deeper. Step 5: Blood vessels are important for supplying nutrients but are not specific to the cortical area. Therefore, the correct answer is A as primordial follicles are located in the cortical area, while other choices are found in different regions of the ovary.

Correct Answer: C

Rationale: The corpus luteum is formed from the ruptured follicle after ovulation. It secretes progesterone, which is crucial for preparing the uterus for implantation and maintaining early pregnancy. Progesterone helps thicken the uterine lining and supports embryo development. Estrogens are mainly produced by the ovaries, not the corpus luteum. Testosterone is primarily produced by the adrenal glands and testes, not the corpus luteum. Therefore, choice C is correct as it accurately describes the main hormone secreted by the corpus luteum.

Correct Answer: B

Rationale: The correct answer is B: the hypothalamus. The hypothalamus secretes gonadotropin-releasing hormone (GnRH) which stimulates the anterior pituitary to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which in turn regulate the secretion of ovarian hormones (estrogen and progesterone). The anterior pituitary secretes FSH and LH in response to GnRH from the hypothalamus. Therefore, the hypothalamus plays a crucial role in controlling the secretion of ovarian hormones. Choices A, C, and D are incorrect because the anterior pituitary releases FSH and LH but is not the primary controller, FSH is a hormone released by the anterior pituitary but is not the primary controller, and LH is released by the anterior pituitary but is not the primary controller of ovarian hormone secretion.