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 following a bone marrow biopsy, is diagnosed with systemic mastocytosis (an excessive proliferation of histamine-containing mast cells). An increased propensity for gastric and duodenal ulcers in this patient is likely ascribable to overproduction of which of the following second messengers in gastric parietal cells?
A. calcium
B. inositol trisphosphate
C. diacyglycerol
D. cGMP
E. cAMP
ANS: E
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Surgical cutting of the ductus deferens as a form of birth control is called a(n) ________
Fill in the blanks with correct word
Which of the following is true of receptors?
A) The most complex, specific, and sensitive receptors are free nerve endings. B) Each has a characteristic sensitivity. C) They are evenly distributed over all surfaces of the body. D) Each receptor is equally sensitive to several different types of stimuli. E) None of the answers are correct.
Which of the following cells secrete gastrin?
A. Enteroendocrine cells B. Chief cells C. Parietal cells D. Regenerative cells E. Mucous cells
The majority of calcium needed to maintain homeostasis is stored in the ______.
A. cytoplasm of cells B. cartilage C. bones D. intracellular fluid