Life Without These Body Fluids Is Impossible

Tears
Tears are produced by the lacrimal glands above and lateral to the eye, and are spread over the eye’s surface by blinking. They are drained into the nasal cavity, which explains why people often get a runny nose when they cry. Tears serve three functions: to lubricate the eye, to remove irritants such as smoke (and a sulfuric acid-producing chemical from cut onions) and in association with emotional states such as sorrow and joy.Dry eye syndrome, the most common eye disease, affects as many as one-third of elderly people, though it can occur at any time in life. The most common cause is decreased tear production, which in most patients occurs for no known reason, though it is associated with a variety of diseases and medications. The most common treatment involves, naturally enough, the use of eye drops.