
Mucus-secreting tubule
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x

Mucin granules
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x

RER
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x

Nuclei
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x

Lumen with mucus
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x

Capillary with red blood cell
The presence of mucin granules in the cells of this mucus-secreting tubule accounts for their foamy appearance seen with the light microscope. The granules contain mucin proteins which become hydrated to form mucus after their release. Trachea 5000x