^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,
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.