Large numbers of mitochondria, interposed between basal infoldings of the plasma membrane, are found in:
a. Intercalated ducts
b. Mucous acini
c. Myoepithelial cells
d. Serous acini
e. Striated ducts
ANS: E
Striated ducts transport ions out of saliva to make saliva hypotonic relative to plasma. To do this, they require numerous mitochondria and an expanded basal surface area of the plasma membrane, which is thrown into folds to accomplish this.
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