Which of the followings is the inferior portion of the uterus. It consists of two parts (supravaginal, vaginal), two openings (internal os, external os) and a cervical canal.

Correct Answer: C

Rationale: The correct answer is C: Cervix. The cervix is the inferior portion of the uterus that consists of two parts (supravaginal, vaginal), two openings (internal os, external os), and a cervical canal. The clitoris (A) is a small sensitive organ located at the top of the vulva. The ovary (B) is a female reproductive organ that produces eggs and hormones. Implantation (D) refers to the attachment of a fertilized egg to the uterine lining, not a specific anatomical structure within the uterus. The cervix clearly fits the description provided, making it the correct answer.

Correct Answer: A

Rationale: The correct answer is A because the convoluted seminiferous tubules are indeed located in the lobules of the male gonad, which is the testis. These tubules are where spermatogenesis occurs, the process of sperm production. Option B is incorrect as the convoluted tubules do not continue with the deferent duct, but they connect to the straight tubules. Option C is incorrect because there are numerous convoluted seminiferous tubules within each testicular lobule, not just three. Option D is incorrect as the convoluted tubules do not continue with the straight tubules directly; they lead to the rete testis before connecting to the straight tubules.

Correct Answer: B

Rationale: Step-by-step rationale for why answer B is correct: 1. The external male genital organ is represented by the urethra, which is the duct that carries urine from the bladder out of the body. 2. The urethra is responsible for both urination and ejaculation. 3. The other choices are incorrect because the external male genital organ is not part of the urinary ducts, not a pair organ, and not located above the scrotum.

Correct Answer: C

Rationale: Step 1: The testicles are primarily responsible for producing male sex hormones. Step 2: Testosterone is the main male sex hormone secreted by the testes. Step 3: Testosterone is an androgenic hormone responsible for male characteristics. Step 4: Progesterone is a female sex hormone, not primarily secreted by the testicles. Step 5: Therefore, the correct answer is C (testosterone).

Correct Answer: B

Rationale: The correct answer is B: the mature ovarian follicle. 1. Ovule formation occurs within the ovary, specifically within a structure called the ovarian follicle. 2. The mature ovarian follicle contains the ovum (oocyte) which develops into the ovule. 3. The ovule is released during ovulation from the mature ovarian follicle. In contrast, the other choices are incorrect: A: The medullar area of the ovary does not play a direct role in ovule formation. C: The Fallopian tube is where fertilization typically occurs, not ovule formation. D: The uterus is not involved in ovule formation; it is the site of embryo implantation during pregnancy.