A radiograph of a 32-year-old woman reveals a perforation in the posterior wall of the stomach in which the gastric contents have spilled into the lesser sac. The general surgeon has opened the lienogastric (gastrosplenic) ligament to reach the lesser sac and notes erosion of the ulcer into an artery. Which of the following vessels is most likely involved?
(A) Splenic artery
(B) Gastroduodenal artery
(C) Left gastric artery
(D) Right gastric artery
(E) Left gastroepiploic artery
Ans: (E) Left gastroepiploic artery
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Which of the following nerves are the components of the large sciatic nerve?
A. Obturator and genitofemoral nerves B. Obturator and femoral nerves C. Pudendal and femoral nerves D. Superior and inferior gluteal nerves E. Tibial and common fibular nerves
What happens to the ammonium ions that are removed from amino acids during deamination?
A) they combine with pyruvate and enter the citric acid cycle B) they combine with CO2 and enter the urea cycle C) they combine with fatty acids and enter beta-oxidation D) they are removed directly by the kidneys E) they combine with CO2 and are exhaled
What structures are used by both the respiratory and digestive systems?
A. Oropharynx and laryngopharynx B. Laryngopharynx and larynx C. Nasal cavity and nasopharynx D. Paranasal sinuses E. Laryngopharynx and esophagus
Which of the following is incorrect pertaining to the CSF?
A) It returns to the venous system by passing into the vertebral venous plexuses. B) It provides some cushioning to the brain when the skull is struck. C) Samples are typically obtained in infants through needle puncture into the posterior cerebellomedullary cistern. D) Overproduction results in hydrocephalus. E) Fractures of the floor of the middle cranial fossa may result in leakage through the external acoustic meatus.