Exam 29: The Gastric Phase of the Integrated Response to a Meal

A patient with severe vertigo secondary to an inner ear infection suffers from a protracted bout of vomiting.She is most at risk for systemic symptoms related to reduced plasma concentration of which of the following electrolytes?

A 60-year-old woman who is hospitalized during recovery from a hysterectomy does not have a bowel movement for several days,although she is eating solid foods.Because intestinal obstruction is suspected,she is returned to the operating room for an exploratory laparotomy.The pattern of motility most likely to be observed in her gastrointestinal tract during the surgery can best be described as:

A patient with a history of gastroesophageal reflux disease has been treated continuously with a proton pump inhibitor that substantially reduces gastric acid secretion.In comparison with a normal individual,the patient is at increased risk for which of the following?

A 30-year-old man is referred to a gastroenterologist for evaluation of persistent dyspepsia (indigestion).He is noted to have other symptoms,including flushing and hypotension,and after a bone marrow biopsy,systemic mastocytosis (an excessive proliferation of histamine-containing mast cells)is diagnosed.An increased propensity for gastric and duodenal ulcers in this patient is probably ascribable to overproduction of which of the following second messengers in gastric parietal cells?

Three medical students (X,Y,and Z)studying for their physiology final examination develop headaches.Student X takes a regular aspirin with a glass of water; Y takes an enteric-coated aspirin with a glass of water; and Z takes an enteric-coated aspirin with a glass of milk (an enteric coating is one that dissolves only when the pH is above 6).Assuming that headache relief is proportional to plasma aspirin concentrations and that X_t,Y_t,and Z_t are the times until relief is experienced by the respective students,which of the following best represents the relationship between X_t,Y_t,and Z_t?