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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.
Answers. Best Answer: The kidneys are composed of various types of epithelial tissue. - The proximal convulated tubule is made up of simple cuboidal epithelium; with microvilli. - The distal convulated tubule is made up of simple cuboidal epithelium; without microvilli.nswers. Best Answer: The kidneys are composed of various types of epithelial tissue. - The proximal convulated tubule is made up of simple cuboidal epithelium; with microvilli. - The distal convulated tubule is made up of simple cuboidal epithelium; without microvilli.