This material is removed and replaced every 10-20 minutes. Nasal secretions include mucous cell products (glycoproteins), plasma proteins (albumin, immunoglobulins), serous cell products ...

Salivary glands can be classified as serous, mucous or seromucous (mixed). In serous secretions, the main type of protein secreted is alpha-amylase, an enzyme that breaks down starch into maltose and ...