Substances secreted include enzymes, hormones, lubricants, surfactants and neurotransmitters. Internal secretion is secretion into the bloodstream. External secretion may be into the intestinal canal or other organs or on to the skin.
Despite anatomical and biochemical similarities, salivary, sweat and lacrimal glandulas differ in their physiological functions. Salivary and tear fluid are required for the proper function of the epithelial layer from which they are secreted. The physiological function of sweat is the elimination of excess heat. Some studies in laboratories for crying have shown several physical effects of crying, such as increased heart rate, sweating, and slowed breathing.
Your ear canal produces a waxy oil called cerumen, which is more commonly known as earwax. People who produce a lot of earwax are more likely to have an earwax blockage and impaction, which is where the wax gets pushed deep inside the ear canal. Swimming can cause some people to produce excess earwax.
The video bellow is from the SciShow YouTube channel and is explaining the most common body fluids such as spit, sweat, tears and earwax. SciShow have seven days program based on an different scientific subjects.