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^Parietal cells of the stomach. A, A nonsecret-ing parietal cell. The cytoplasm is filled with tubulovesicular membranes, and the intracellular canaliculi have become internalized, distended, and devoid of microvilli. B, An actively secreting parietal cell. Compared to the resting parietal cell,

Golgi apparatus

Mitochondria

Tubulovesicular membrane

Intracellular canaliculus

Basement lamina the most striking difference is the abundance of long microvilli and the paucity of the tubulovesicular system, making the mitochondria appear more numerous. (From Ito S. Functional gastric morphology. In: Johnson LR, Christensen J, Jackson MJ, et al. eds. Physiology of the Gastrointestinal Tract. New York: Raven, 1987.)

Basement lamina

Mitochondria

Tubulovesicular membrane

Intracellular canaliculus the most striking difference is the abundance of long microvilli and the paucity of the tubulovesicular system, making the mitochondria appear more numerous. (From Ito S. Functional gastric morphology. In: Johnson LR, Christensen J, Jackson MJ, et al. eds. Physiology of the Gastrointestinal Tract. New York: Raven, 1987.)

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