Identifying Cartilage in Bronchial Histology

Steps:

• Recall that bronchi feature C-shaped hyaline cartilage rings for structural support.
• Examine the photomicrograph for dense, eosinophilic matrix with chondrocytes in lacunae, typical of cartilage.
• Compare labels: A shows ciliated epithelium, B indicates irregular dense tissue, C appears as smooth muscle bands, D resembles glandular areas.
• Confirm B matches cartilage's histological appearance under standard staining.

Why B is correct:

• Bronchial cartilage consists of hyaline type with a basophilic matrix and lacunae-bound chondrocytes, providing rigidity as per respiratory anatomy.

Why the others are wrong:

• A: Pseudostratified ciliated epithelium lines the bronchial lumen for mucociliary clearance.
• C: Smooth muscle forms helical bands that regulate airway diameter.
• D: Submucosal glands secrete mucus for protection.

Final answer: B