A student had to compare four microscope slides showing sections from different regions of the gas exchange system. Slide 1: missing - cartilage, glands; seen - few goblet cells, ciliated epithelial cells, smooth muscle. Slide 2: seen - incomplete cartilage rings, glands, goblet cells, ciliated epithelial cells, smooth muscle. Slide 3: missing - cartilage, glands, goblet cells, smooth muscle; seen - squamous epithelial cells. Slide 4: seen - plates of cartilage, glands, goblet cells, ciliated epithelial cells, smooth muscle. 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