Human<unk> <unk>  are a clear liquid secreted by the lacrimal glands <unk> gland) found in the eyes of all land mammals. Their functions include lubricating the eyes (basal<unk> , removing irritants (reflex<unk> , and aiding the immune system.<unk>  also occur as a part of the body's natural pain response. Humans are the only mammals known to produce<unk>  as part of an emotional response, such as out of joy or grief.<unk>  have symbolic significance among humans (see crying). Emotional secretion of<unk>  may serve a biological function by excreting stress-inducing hormones built up through times of emotional distress.<unk>  are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes. The different types of<unk> —basal, reflex, and emotional—vary significantly in composition. Anatomy of lachrymation, showing
Tears
Whitlow
Drustbed
Squawk 
Elscint
Wart
Doula
Caul