Glomerulus · Histology

What is the primary histological appearance of the 'macula densa' cells?

  1. Large, clear cells with no nuclei
  2. Crowded, tall columnar cells in the distal tubule
  3. Flattened squamous cells surrounding the renal capsule
  4. Star-shaped cells located in the medulla
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Correct answer: Crowded, tall columnar cells in the distal tubule

The macula densa consists of a specialized, densely packed cluster of tall epithelial cells in the distal straight tubule where it contacts the vascular pole. They function as chemoreceptors for sodium chloride levels in the filtrate.

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