A student was asked to state the differences seen on four microscope slides of sections from different regions of the gas exchange system. slide 1: cartilage and glands absent; few goblet cells, ciliated epithelial cells and smooth muscle present slide 2: incomplete cartilage rings, glands, goblet cells, ciliated epithelial cells and smooth muscle present slide 3: cartilage, glands, goblet cells and smooth muscle absent; squamous epithelial cells present slide 4: plates of cartilage, glands, goblet cells, ciliated epithelial cells and smooth muscle present Which option correctly identifies the parts of the gas exchange system?
- Aslide 1: alveolus; slide 2: bronchiole; slide 3: bronchus; slide 4: trachea
- Bslide 1: bronchiole; slide 2: bronchus; slide 3: alveolus; slide 4: trachea
- Cslide 1: bronchiole; slide 2: trachea; slide 3: alveolus; slide 4: bronchus
- Dslide 1: bronchus; slide 2: trachea; slide 3: bronchiole; slide 4: alveolus