The tissue demonstrated in the image is which organ?

• A. Kidney
• B. Liver
• C. Spleen
• D. Lung

Answer: (A)

Renal tissue is identified by the presence of nephron components, especially a glomerulus within Bowman's capsule and surrounding tubules. In a kidney section, you look for a tuft of capillaries (the glomerulus) with Bowman's space, plus tubular structures lined by epithelium that differs between proximal and distal segments. Proximal tubules typically have a more cuboidal, eosinophilic cytoplasm with a sometimes brush-border–like appearance, while distal tubules show lighter staining and clearer lumens. This organized arrangement of glomeruli and tubules contrasts with the other organs: the liver shows plates of hepatocytes around central veins and portal triads; the spleen shows white pulp around arteries and red pulp with sinusoids; the lung displays alveolar sacs and bronchioles rather than glomeruli. The image depicts the kidney based on those distinctive nephron structures.