Irritant receptors in the lower airway respond to all except:
A. chemical vapors
B. physical factors
C. distortion of the alveolar walls
D. particles
ANS: C
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Which is not a function of the blood-brain barrier?
A. It protects brain neurons from exposure to abnormal hormone levels. B. It protects brain neurons from exposure to abnormal ion levels. C. It prevents brain neurons from being exposed to waste products in the blood. D. It prevents nicotine and alcohol from entering brain interstitial fluid. E. It prevents brain neurons from being exposed to drugs.
Cytotoxic T-lymphocytes that have killed a foreign cell may transform into
A. memory B-lymphocytes. B. natural killer cells. C. plasma cells. D. helper T-lymphocytes. E. None of the choices is correct.
In the stress response, the process by which many structures are activated simultaneously is known as ________ activation.
Fill in the blank(s) with the appropriate word(s).
Why does rigor mortis result in muscular rigidity after death?
A. The enzyme that hydrolyzes ATP is no longer being produced; therefore, the myosin heads will not receive the actin filament. B. The ATP necessary to bind to the myosin head and release the cross bridge is no longer present. C. ATP production is no longer possible; therefore, cross bridges cannot be formed. D. A buildup of intracellular calcium keeps the troponin molecule free of the active site on actin.