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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单项选择题
The blood-gas barrier in alveoli may include each of the following EXCEPT
A．cytoplasm of a type Ⅱpneumocyte
B．basal lamina of type Ⅰalveolar cells
C．cytoplasm of a type Ⅰpneumocyte
D．endothelium of a continuous capillary
E．basal lamina of an endothelial cell
单项选择题
Which of the following statements concerning adrenal parenchymal cells is TRUE
A．Those of the zona fasciculate produce androgens
B．Those of the adrenal medulla produce epinephrine and norepinephrine
C．Those of the zona glomerulosa produce glucocorticoids
D．Those of the cortex contain numerous secretory granules
E．Those of the adrenal medulla produce glucocorticoids
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