Some of the saltiest sources of packaged foods include: 1  deli meat. 2  frozen pizza. 3  vegetable juices.  canned 1  soup. canned or bottled tomato products.
Antibodies show the following characteristics and perform different functions. (i) IgA: It is the second most abundant class, constituting about 10 to 15 per cent of antibodies of serum. It is mainly found in sweat, tears, saliva, mucus, colostrum (first milk secreted by a mother) and gastrointestinal secretions. Smaller quantities are present in blood and lymph.
Other Secretions. 1  Saliva is a fluid secreted by the salivary glands. It moistens and lubricates and has an optimum pH of 6.5-7.5. 2  Lysozyme is an enzyme secreted by the salivary glands. It kills bacteria. 3  Mucus is a fluid secreted by the foveolar cells in the stomach. It protects the stomach wall.