Saliva (also referred to as spit or spittle)'s the watery and usually frothy substance produced in the mouths of humans and most other animals. Saliva's produced in and secreted from the salivary glands. Human saliva's composed mostly of water, but also includes electrolytes, mucus, antibacterial compounds, and various enzymes. As part of the initial process of food digestion, the enzymes in the saliva break down some of the starch and fat in the food at the molecular level. Saliva also breaks… (More on Saliva)