Here's why:
* Exocrine glands secrete substances through ducts to a surface. Salivary glands release saliva through ducts into the mouth.
* Endocrine glands secrete hormones directly into the bloodstream. Salivary glands do not secrete hormones.
Therefore, salivary glands are classified as exocrine glands because they secrete a product (saliva) through ducts to an external surface (the oral cavity).
