The endocrine role of the testicle:

Correct Answer: C

Rationale: The correct answer is C because the endocrine role of the testicle primarily involves the secretion of testosterone. Testosterone is the main androgenic hormone produced by the testicles, which plays a crucial role in various physiological functions such as the development of male reproductive organs, sperm production, and secondary sexual characteristics. Choice A is incorrect because while interstitial cells (Leydig cells) are involved in the production of testosterone, the endocrine role of the testicle is not limited to these cells alone. Choice B is incorrect as it is too general. While androgenic hormones are indeed secreted by the testicles, testosterone specifically is the main androgenic hormone produced by them. Choice D is incorrect as the maturation of sex organs is primarily regulated by the action of testosterone but is not the sole endocrine role of the testicle.

Correct Answer: A

Rationale: Step-by-step rationale for choice A being correct: 1. Sperm cells need to be mobile to reach the egg for fertilization. 2. Seminal fluid provides the environment for sperm motility. 3. Sperm cells acquire motility in the seminal fluid due to specific nutrients and ions present. Summary of why other choices are incorrect: - Choice B: Being microscopic is a general characteristic of sperm cells but not specific to their mobility. - Choice C: Sperm cells are stored in the epididymis, not the "crotum." - Choice D: Sperm cells are all of the same kind, not three different kinds.

Correct Answer: C

Rationale: Step 1: The ovary is a complex organ with distinct internal structures. Step 2: The ovarian cortex houses ovarian follicles, which are crucial for reproductive functions. Step 3: Ovarian follicles contain oocytes and support cells for oocyte development. Step 4: Therefore, choice C is correct as it accurately describes the structural aspect of the ovary. Summary: Choices A, B, and D are incorrect as they do not accurately describe the structural components of the ovary. Choice A talks about elastic tissue, choice B mentions glandular parenchyma, and choice D refers to blood vessels, none of which are specific to the structural arrangement of the ovary.

Correct Answer: D

Rationale: Step-by-step rationale for why choice D is correct: 1. The lateral extremity of the Fallopian tube is connected to the uterus through the uterine ostium. 2. This connection allows the passage of the ovum from the Fallopian tube to the uterus for implantation. 3. The uterine ostium serves as the entry point for the ovum to travel from the Fallopian tube to the uterus. 4. Therefore, choice D is correct as it accurately describes the anatomical connection between the Fallopian tube and the uterus. Summary: - Choice A is incorrect because the lateral extremity of the Fallopian tube does not open in the abdominal cavity. - Choice B is incorrect because the Fallopian tube does not capture the ovule released by the ovary. - Choice C is incorrect because the lateral extremity of the Fallopian tube does not display flared edges. - Choice D is correct as it accurately describes the anatomical connection

Correct Answer: A

Rationale: The pituitary FSH (Follicle Stimulating Hormone) controls the maturation of ovarian follicles by stimulating their growth and development. FSH plays a crucial role in the early stages of the menstrual cycle. Estrogen secretion is primarily regulated by the ovaries, not FSH. Ovulation is mainly triggered by the surge in LH (Luteinizing Hormone) levels, not FSH. Progesterone secretion is mainly controlled by the corpus luteum, which forms after ovulation, not directly by FSH. Therefore, the correct answer is A as FSH directly influences the growth and maturation of ovarian follicles.