An 18-yr-old female patient who has been admitted to the emergency department after a motor vehicle crash is scheduled for chest and abdominal x-rays. Which information may alter the plans for the x-rays?

Correct Answer: B

Rationale: The correct answer is B: Positive result of hCG test. This may indicate that the patient is pregnant, which would significantly alter the plans for the x-rays due to the potential harm to the fetus from radiation exposure. A: Report of abdominal pain is a common symptom after a motor vehicle crash and would not directly alter the plans for x-rays. C: Blood pressure of 172/88 mm Hg could indicate hypertension but would not directly impact the need for chest and abdominal x-rays. D: Temperature of 102.1°F (38.9°C) could suggest an infection but would not typically change the necessity for x-rays.

Correct Answer: B

Rationale: The correct answer is B. Sperm are stored in the epididymis, ascend into the vas deferens prior to ejaculation, and are discharged from the penis through the urethra. The epididymis is where sperm mature and are stored. The vas deferens is the duct through which sperm travels from the epididymis to the urethra for ejaculation. The urethra is the final pathway for sperm to exit the body. Choices A, C, and D are incorrect because they do not follow the correct anatomical pathway of sperm from storage to ejaculation.

Correct Answer: C

Rationale: The correct answer is C because the luminal epithelium of efferent ductules is indeed irregular, which helps in absorption and modification of fluid. A, Leydig cells are located outside the seminiferous tubule. B, Sertoli cells provide nourishment and support to developing sperm cells but do not mature spermatids. D, Contraction of smooth muscle in vas deferens is stimulated by the parasympathetic nervous system, not the sympathetic.

Correct Answer: A

Rationale: The correct answer is A: Seminoma is the commonest pure testicular germ cell tumor. Seminoma is indeed the most common pure germ cell tumor of the testis, accounting for about 40-50% of cases. It typically presents in young adult males and has a good prognosis. Seminoma histologically consists of clear cytoplasmic glycogen and distinct cell borders. Choice B is incorrect as it seems to be incomplete. Choice C is incorrect as AFP (alpha-fetoprotein) increases in yolk sac tumors, not choriocarcinoma. Choice D is incorrect as Schiller-Duvall bodies are characteristic of embryonal carcinoma, not yolk sac tumors.

Correct Answer: C

Rationale: The testes originate in the abdominal cavity in a fetus. During development, they descend into the scrotal sac through the inguinal canal. This process is essential for proper sperm production as the scrotal environment provides optimal temperature for sperm development. The other choices are incorrect because the testes do not initially form in the scrotal sac, pelvic cavity, or retroperitoneal space. The correct sequence of descent from the abdominal cavity to the scrotal sac is crucial for normal reproductive function.