Which structure is a finger-like projection of the mucosa in the small intestine, formed by simple columnar epithelium?

Which structure is a finger-like projection of the mucosa in the small intestine, formed by simple columnar epithelium?

• A. Goblet cell
• B. Microvilli
• C. Intestinal villus
• D. Crypts of Lieberkühn

Answer: (C)

It's about how the small intestine increases surface area through mucosal projections called intestinal villi. Each villus is a finger-like projection formed by a single layer of tall simple columnar epithelial cells with goblet cells scattered among them, and a core of lamina propria that houses blood vessels and a central lacteal for nutrient transport. This structure dramatically boosts absorption by bringing more surface area into contact with chyme and providing direct routes for nutrients to enter the bloodstream or lymphatic system. Goblet cells are mucus-secreting cells within the epithelium, not the projections themselves. Microvilli are tiny, micrometer-scale folds on the apical surface of enterocytes that further increase surface area but are not standalone mucosal projections. Crypts of Lieberkühn are invaginations or glands at the bases of the villi, not finger-like projections of the mucosa.

It's about how the small intestine increases surface area through mucosal projections called intestinal villi. Each villus is a finger-like projection formed by a single layer of tall simple columnar epithelial cells with goblet cells scattered among them, and a core of lamina propria that houses blood vessels and a central lacteal for nutrient transport. This structure dramatically boosts absorption by bringing more surface area into contact with chyme and providing direct routes for nutrients to enter the bloodstream or lymphatic system.

Goblet cells are mucus-secreting cells within the epithelium, not the projections themselves. Microvilli are tiny, micrometer-scale folds on the apical surface of enterocytes that further increase surface area but are not standalone mucosal projections. Crypts of Lieberkühn are invaginations or glands at the bases of the villi, not finger-like projections of the mucosa.