Paneth cells are best described as which of the following?

• A. Hormone-producing cells in the pancreas
• B. Immune cells in the gut
• C. Muscle cells in the gut
• D. Nerve cells in the gut

Answer: (B)

Paneth cells are specialized secretory epithelial cells located at the base of the intestinal crypts, primarily in the small intestine. Their main job is to support the gut’s innate immune defense by releasing antimicrobial substances such as α-defensins and lysozyme into the crypt lumen, helping to regulate the microbial environment and protect the crypt’s stem cell niche. This immune-related role in the gut is why the description of these cells as immune cells in the gut is the best fit. They are not hormone-producing cells of the pancreas, nor muscle or nerve cells.