A patient with prolonged diarrhea undergoes esophagogastroduodenoscopy. Biopsy of the small intestine demonstrates numerous crescent-shaped protozoa adjacent to the epithelial brush border. Which of the following organisms is the most likely pathogen?
A 25-year-old woman with sickle cell anemia complains of steady pain in her right upper quadrant with radiation to the right shoulder, especially after large or fatty meals. Her physician diagnoses gallstones. Of which of the following compounds are these stones most likely composed?
IV administration of drug X to an anesthetized animal produces an increase in blood pressure. After administration of drug Y, readministration of drug X produces a decrease in blood pressure. Which of the following pairs of drugs could produce this sequence of events?
A 37-year-old woman who was diagnosed with AIDS 3 years earlier is unable to work, is physically debilitated, and requests her physician to provide her with medications with which to take her own life. The most common emotional disorder that results in such requests by patients is
What is the primary
function of the cell pointed to in the figure above?
A patient with familial hypercholesterolemia undergoes a detailed serum lipid and lipoprotein analysis. Studies demonstrate elevated cholesterol in the form of increased LDL without elevation of other lipids. This patient's hyperlipidemia is best classified as which of the following types?
A chronic alcoholic develops severe memory loss with marked confabulation. Deficiency of which of the following vitamins would be most likely to contribute to the neurologic damage underlying these symptoms?
A 72-year-old male is noted as having a 9-pound weight loss over the past few weeks. His past medical history is significant for oat cell carcinoma of the lung, without known metastases, for which he is currently undergoing treatment. The patient states that even though his wife is preparing his favorite meals, he is not hungry. Which of the following would be the best treatment option to improve his eating habits?
In the clotting process, as the hemostatic plug develops, fibrin polymerizes into monomeric threads which are held together by noncovalent bonds. Which clotting protein increases the strength of the clot by crosslinking the newly formed fibrin threads?
A surgeon performing an appendectomy
makes an incision through the ventrolateral wall. Which of the following
corresponds to the order of penetration of the layers of the abdominal
wall?
1. Internal oblique
2.
External oblique
3. Peritoneum
4. Transversus abdominis