Explain5 marksStandard
A student examines a photomicrograph of a transverse section of a bronchus and observes cartilage, smooth muscle, ciliated epithelium, and goblet cells. The student also views an electron micrograph of an alveolus showing squamous epithelium and surrounding capillaries.
Explain the roles of the following structures in the human gas exchange system:
- cartilage
- smooth muscle
- ciliated epithelium
- goblet cells
- squamous epithelium of the alveoli