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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.
ANSWER: Correct This is a thin single layer of cells that allows for diffusion. Part D What type of epithelial tissue lines kidney tubules? ANSWER: Correct The simple cuboidal cells of kidney tubules allow for both secretion and absorption.