May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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35Gas ExchangeMedium1 mark
The photomicrograph shows a transverse section through a bronchus.
Photomicrograph of a transverse section through a bronchus wall, from the airway lumen (top) outward. Label X brackets the ciliated epithelium lining the lumen. Label Y brackets a dense, dark-staining band of smooth muscle directly beneath the epithelium. Paler connective tissue and, at the very bottom of the image, cartilage containing rounded chondrocytes lie further out, unlabelled.
What is the function of the tissues X and Y?
XY
Asecrete mucusprevent collapse of the airway
Bremove pathogens from airwaydeliver oxygen to surrounding tissues
Ctrap dust and dirtstore energy
Dwaft mucus upwardsconstrict airway