Approximately how long does it take sperm to get to the site of fertilization?

Correct Answer: D

Rationale: The correct answer is D: 3 hours. After ejaculation, sperm needs to travel through the female reproductive tract to reach the site of fertilization in the fallopian tube. This journey typically takes around 3 hours due to the distance and obstacles the sperm must overcome. Choice A (2 mins) is too short for sperm to travel such a distance. Choice B (20 mins) is also insufficient for the journey. Choice C (60 mins) is closer but still underestimates the time required for sperm to reach the fallopian tube.

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: cervicitis. Cervicitis specifically refers to inflammation of the cervix, often due to an infection. Vaginitis (B) is inflammation of the vagina, not the cervix. Cercicopathy (C) is not a medical term. Vaginoplasty (D) is a surgical procedure to reconstruct or tighten the vagina, unrelated to inflammation or infection of the cervix.

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.