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Answer: 3. proximal convoluted tubule of nephron

Key idea: Brush-border cuboidal epithelium is found where absorption and secretion occur.

It lines the proximal convoluted tubule of the nephron. The intestine lining has columnar epithelium with microvilli, salivary gland ducts have cuboidal epithelium without brush border, and the eustachian tube has ciliated columnar epithelium.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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