The lungs of humans are protected by a sophisticated defense system. Similarly, fish have a specialized system to protect their gills. This is a close-up view of the gills of a zebrafish and the ...

The tissue shown here is from the small intestine of a mouse; the blue spots are goblet cells, which produce protective mucus. We mainly curse mucus as we are blowing it from our noses or coughing it ...

The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and goblet cells to clean the air before it reaches the lungs Goblet ...

Large, round extrusions, known as goblet cells, secrete mucous to catch dust ... to study the effects of malaria and smoking on the lungs.