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The apical cytoplasm of the gastric oxyntic or acid-secreting cell contains a striking array of smooth-surfaced tubular elements (6, 7, 14, 16) . These smooth-surfaced elements may assume various shapes depending on preparatory procedures, so that profiles of elongated elements and vesicles are observed (8, 15) . The inclusive term "vesicotubules" has been used to describe such a system in the amphibian oxyntic cell (10) . During the secretion of gastric acid provoked by histamine, insulin, gastrin, or electrical vagal stimulation there is marked amplification of cell surface membrane adjacent to the lumen of the gastric gland (1, 5, 12, 13, 20-22, 24) . The enhanced apical surface consists of numerous long and sometimes branching microvilli projecting into the lumen of the gastric gland (amphibian cell type) or intracellular canaliculus (mammalian cell type) . This fine structural pattern which involves an increased surface area associated with acid secretion is thought to result at the expense of the "membrane reserve" which exists in the form of smooth-surfaced tubules and vesicles in the apical cytoplasm (2, 13, 16, 24) . Occasional tubules or vesicles have been observed communicating with

UPTAKE OF PEROXIDASE INTO THE SMOOTH-SURFACED TUBULAR SYSTEM OF THE GASTRIC ACID-SECRETING CELL