单项选择题

A nephron includes all of the following components EXCEPT

A．A renal corpuscle
B．A distal convoluted tubule
C．A thin limb of the loop of Henle
D．A collecting tubule
E．Pars recta of the proximal tubule
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单项选择题
Renal filtration barrier consists of all of the following components EXCEPT
A．The fenestrated endothelium of the glomerular capillaries
B．The basal lamina
C．The filtration slits with diaphragms between pedicels
D．Medullary rays
E．Renal capsule
单项选择题
Which of the following statements about Langerhans’ cells is TRUE
A．They commonly are found in the dermis
B．They function as sensory mechanoreceptors
C．They function as receptors for cold
D．They play an immunologic role in the skin
E． They are of epithelial origin
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