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The proximal tubules make up a significant portion of the kidneys; proximal tubule epithelial cells are the most populous cell type in the kidney, and carry out diverse regulatory and endocrine functions where numerous transporters are located.he proximal tubules make up a significant portion of the kidneys; proximal tubule epithelial cells are the most populous cell type in the kidney, and carry out diverse regulatory and endocrine functions where numerous transporters are located.
Identification: Squarish cells with round nuclei in a single row (arrows), usually arranged in a circle (tubule). Features to Know: nuclei. Where Located: kidney tubules (can also be seen in sweat glands of skin slide). Function: absorption and secretion.