Dark, intensely stained, membrane-bound secretory granules are visible in electron micrographs of the cytoplasm of which cell type?
a. Cells of the zona fasciculata of the adrenal cortex
b. Follicle cells of the thyroid gland
c. Norepinephrine-containing chromaffin cells of the adrenal medulla
d. Oxyphil cells of the parathyroid gland
e. Pituicytes of the posterior pituitary gland
ANS: C
Adrenal cortical cells, follicle cells, oxyphil cells, and pituicytes do not have appreciable numbers of secretory granules in their cytoplasm. The norepinephrine-containing secretory vesicles of chromaffin cells stain particularly darkly with stains used for electron microscopy.
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