Nasal secretions include mucous cell products (glycoproteins), plasma proteins (albumin, immunoglobulins), serous cell products (secretory IgA, peroxidase, lysozyme), and miscellaneous substances ...

Humans have three paired major salivary glands (parotid, submandibular, and sublingual), as well as hundreds of minor salivary glands. Salivary glands can be classified as serous, mucous or seromucous ...