Which ultrastructure feature is characteristic of pancreatic acinar cells?
a. Abundant apical microvilli
b. Apically located secretion vesicles
c. Basally located mitochondria enclosed by infoldings of the plasma membrane
d. Mitochondria with tubular cristae
e. Numerous lipid droplets
ANS: B
Like in most actively secreting epithelial cells whose activity is regulated by nerves and hor-mones, secretory product is stored in apical secretion granules until the process of exocytosis.
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