The roles of the testicle are:

Correct Answer: C

Rationale: Rationale for correct answer (C): The main function of the testicles is spermatogenesis, which is the process of producing sperm cells. This is a crucial role in male reproductive system. Spermatogenesis occurs in the seminiferous tubules of the testes. Other functions like producing androgenic hormones (choice B) are mainly carried out by the Leydig cells in the testes, not the testicles themselves. While the testicles do play a role in semen production (choice D), this is not their primary function. Therefore, the correct answer is C as it directly relates to the main purpose of the testicles in the male reproductive system.

Correct Answer: A

Rationale: The correct answer is A: head. The spermatozoon is composed of three main parts: head, mid piece or neck, and flagellum. The head contains the nucleus which carries genetic material. The mid piece or neck contains mitochondria for energy production. The flagellum is responsible for sperm motility. In this question, the head is the most essential part of the spermatozoon as it contains the genetic material required for fertilization. The other choices (B: mid piece or neck, C: flagellum, D: body) are incorrect as they are important for sperm function but do not carry the genetic material necessary for fertilization.

Correct Answer: B

Rationale: The correct statement is B: it displays the glandular parenchyma on the inside. The ovary contains specialized tissue called parenchyma, which consists of follicles that house the ova (eggs). This glandular tissue is responsible for producing hormones like estrogen and progesterone. Rationale: - A is incorrect because the ovary is actually covered by a specialized epithelial layer called the germinal epithelium, not a simple epithelium. - C is incorrect because while the ovary does contain follicles at various stages of development, this alone does not encompass the entire function or structure of the ovary. - D is incorrect because the ovary is connected to the Fallopian tube via the infundibulopelvic ligament, not directly by ligaments.

Correct Answer: B

Rationale: The correct answer is B: uterus. The Fallopian tube connects the ovaries to the uterus, allowing eggs to travel from the ovaries to the uterus for fertilization. The vagina (A) is not directly connected to the Fallopian tube but serves as the birth canal. The ovary (C) is where eggs are produced and released into the Fallopian tube, not directly linked to it. The vulva (D) is the external part of the female genitalia and is not connected to the Fallopian tube.

Correct Answer: C

Rationale: The correct answer is C: the uterus. The uterine artery vascularizes the uterus, providing the main blood supply to this reproductive organ. This artery plays a crucial role in supplying oxygen and nutrients to the uterus, supporting the growth and development of the endometrium and the fetus during pregnancy. Choice A, the vagina, is incorrect because the vaginal artery, not the uterine artery, supplies blood to the vagina. Choice B, the Fallopian tubes, is incorrect as they are primarily vascularized by the tubal branches of the ovarian arteries. Choice D, the vulva, is also incorrect as the blood supply to the vulva comes from multiple sources including the internal pudendal artery and the external pudendal artery, not the uterine artery.