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 research physiologist is performing an experiment in which he stimulates sympathetic cholinergic neurons. Which of the following responses is expected?
A 30-year-old man is found to have a mass in his left anterior neck. Chest x-ray films are normal. A CT scan of the thorax and abdomen shows a hemorrhagic right adrenal mass. Serum electrolytes are remarkable for decreased calcium levels. Which of the following neoplasms is most likely responsible for the depression of calcium levels in this patient?
Deficiency in which of the following usually predisposes to thrombosis rather than bleeding?
A newborn infant has multiple, hemorrhagic, cutaneous lesions and does not respond to sound. Head CT scan shows periventricular calcifications. Which of the following infectious agents is the most likely cause of this child's presentation?
A strict vegetarian is not getting sufficient vitamin D in his diet, and he develops osteomalacia. This disease is characterized by which of the following changes in his bones?
A three-year-old child is brought to the emergency room after inhaling a peanut. The peanut has lodged in the right mainstem bronchus, largely occluding it. The child is cyanotic, and non-invasive transcutaneous monitoring reveals a PO2 of 60 mm Hg. Which of the following mechanisms best accounts for the child's hypoxemia?
A couple brings in their 6-month-old child because they are concerned about the child's inability to sit without support. The physician interviews the parents and ascertains that they are both Ashkenazic Jews. The doctor should inform them that, because of their heritage, their child may have an increased risk of which of the following disorders?
Which of the following is specifically associated with infection with Schistosoma haematobium?
A football player is examined by the team doctor following a shoulder injury during a game. Preliminary x-rays show an inferior dislocation of the humerus. On further examination, there is weakness in lateral rotation and abduction of the arm. The nerve most likely affected is the