单项选择题

Seminiferous tubules contain all of the following components EXCEPT

A．Sertoli cells
B．Spermatocytes
C．A fibrous connective tissue tunic
D．Skeletal muscle in their tunica propria
E．A germinal epithelium
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单项选择题
All of the following cell types are found in the brain EXCEPT
A．Purkinje cells
B．Stellate cells
C．Schwann cells
D．Small granule cells
E．Pyramidal cells
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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