mucus
A lining made of mucus.
Your skin is the biggest thing that protects your body.
Tar is the sticky substance that is found on tobacco leaves, when smoked this sticky substance coats the inside of your lungs and ball sack- preventing oxygen from reaching the circulatory system.
Surfactant
Goblet cells are found in the respiratory epithelium. They produce mucous which coats the tubes. Goblet cells are found scattered among the epithelial lining of organs, such as the intestinal and respiratory tracts. They are found inside the trachea, bronchi, and larger bronchioles in the respiratory tract, small intestines, the large intestine, and conjunctiva in the upper eyelid.
mucus in the stomach coats the stomach walls to protect against the stomach acid. Mucus also coats some of the food to allow it to slide through the digestion track easier. Someone will have to talk about the lungs I knew there was moisture in the lungs but not mucus
placing coats
The stomach is protected by the epithelial cells, which produce and secrete a bicarbonate-rich solution that coats the mucosa. Bicarbonate is alkaline, a base, and neutralizes the acid secreted by the parietal cells, producing water in the process. This continuous supply of bicarbonate is the main way that your stomach protects itself from autodigestion (the stomach digesting itself) and the overall acidic environment.
The substance that coats B cells is called antibodies or immunoglobulins. These proteins are produced by B cells and play a crucial role in the immune response by binding to specific antigens to help neutralize or eliminate pathogens.
Mucus
The main ingredient of silk is fibroin, a protein produced by silkworms, particularly the Bombyx mori species. Silk also contains sericin, a gelatinous substance that coats and protects the fibroin fibers. Together, these proteins contribute to silk's unique properties, such as its softness, luster, and strength.
Tapetum