A 45-year-old homeless man has a chronic cough, a cavitary lesion of the lung, and is sputum positive for acid-fast bacilli. Which of the following is the principle form of defense by which the patient's body fights this infection?
A researcher is examining the distribution of an ion channel protein in the kidney. She incubates slices of kidney tissue in a dilute solution of a specific antibody directed against the protein, then uses the immunoperoxidase method to localize the ion channel proteins. She notes the presence of brown pigment in a population of epithelial cells, which on closer examination, have a brush border. The researcher concludes that the protein is probably present in cells of the
A mutation affecting the development of the diencephalon could interfere with the secretion of which of the following hormones?
A pastry chef cut his finger while slicing a cake. After a week, the site of the injury is warm, red, and swollen, and begins draining pus. While preparing some cream pies, he contaminates the custard with drainage from the lesion. The pies were eaten several days later by patrons of the restaurant. Within 4 hours they developed diarrhea and vomiting with no fever. Which of the following organisms would be most likely to cause these symptoms?
A 58-year-old homeless man is brought in to the emergency room by police. His temperature is 101.8°F rectally, and he smells of cheap wine. Physical examination is remarkable for dullness to percussion, increased vocal fremitus, and decreased breath sounds and wet crackles on the right. Chest x-ray reveals consolidation of the right upper lobe. One of the nurses notes the production of thick, bloody sputum when the man coughs. The most likely causative organism is
In the transition from a Graafian follicle to a functional corpus luteum, which of the following cellular events occurs?
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 62-year-old man presents to the emergency department with acute onset of severe ocular pain accompanied by blurred vision that is associated with halos around lights. On examination, the left eye is red and hard; the cornea is described as having a steamy appearance, and mydriasis is noted. The most appropriate agent for the treatment of this patient's acute signs and symptoms is
A 54-year-old male with acute lymphocytic leukemia develops a blast crisis. He is treated with intensive systemic chemotherapy. Following treatment, the patient will be at increased risk for the development
Most fascia of the body that attach to bones attach by which of the following mechanisms?