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bssampleitems - ASSOCIATION OF AMERICAN MEDICAL COLLEGES...

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ASSOCIATION OF AMERICAN MEDICAL COLLEGES Sample MCAT Items: BIOLOGICAL SCIENCES (Extracted from MCAT Practice Test 3R ) www.aamc.org/mcat
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Passage III (Questions 151-155) The runny nose associated with common colds is related to the release of either virus-induced histamine or acetylcholine. The nasal mucosa contain receptors for both histamine and acetylcholine. Activation of either of these receptor types results in increased secretion by nasal glands, producing a runny nose. In an attempt to treat this condition, several new drugs have been investigated. Drug A primarily blocks histamine receptors but also partially blocks acetylcholine receptors. Drug B blocks histamine receptors but has no effect on the acetylcholine receptors. Eighteen subjects with severe common colds, whose symptoms were judged to be identical, were randomly assigned to three groups. Patients A-F in Group 1 received Drug A, Patients A-F in Group 2 received Drug B, and those in Group 3 were treated with a nondrug placebo. After 4 hours, patients reported their
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bssampleitems - ASSOCIATION OF AMERICAN MEDICAL COLLEGES...

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