Regarding sparse vs. dense word representations, which are true?

Endometriosis accounts for 30-50% of infertility patients.

Estrogen, from a single large antral follicle, triggers a surge in _______ resulting in ovulation and the formation of the corpus luteum.

The dissemination of cancer cells from the left testis would enter the testicular veins and then first enter which of the following veins?

How might a surgeon differentiate between the jejunum and the ileum when she is performing exploratory laparotomy?

A 51-year-old man presents in the emergency department with a complaint of sharp pain and cramping. Follow-up imaging reveals a tumor in the head and uncinate process of the pancreas. Which of the following vessels is most immediately at risk for occlusion if this tumor enlarges?

A patient presents with acute abdominal pain and fever. Examination of her abdomen reveals fluid (ascites) within the lesser sac, which is now draining into the greater peritoneal sac. Which of the following pathways accounts for the seepage of fluid from the lesser to the greater sac?

A 73-year-old woman is admitted to the hospital with significant abdominal ascites. When she sits upright on the side of her bed, the intraperitoneal fluid accumulates in her pelvis. Which of the following sites represents the lowest extent of the female abdominopelvic cavity where this fluid will collect?

A patient with a midshaft compound humeral fracture presents with bleeding and clinical signs of nerve entrapment. Which of the following nerves is most likely injured by the fracture?

A baseball pitcher delivers a 97-mph fastball to a batter and suddenly feels a sharp pain in his shoulder on release of the ball. The trainer examines the shoulder and concludes that the pitcher has a rotator cuff injury. Which muscle is most vulnerable and most likely torn by this type of injury?