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下列关于通气/血流比值的描述,正确的是()
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视网膜中央凹的视敏度最高,其原因是()
Assume that excess blood is transfused into a patient whose arterial baroreceptors are nonfunctional and whose blood pressure increases from 100 to 150 mm Hg. Then, assume that the same volume of blood is infused into the same patient under conditions in which his arterial baroreceptors are functioning normally and blood pressure increases from 100 to 125 mm Hg. What is the approximate feedback “gain” of the arterial baroreceptors in this patient when they are functioning normally? ( )
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Which of the following capillaries has the lowest capillary permeability to plasma molecules?( )
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