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It turns out that you contain more than 50 glands. And some of them have extremely funny names. Like Meibomian gland, Ebner's glands, and the unforgettable Glands of Zeis. Research has revealed that each gland produces its own specialized goop that does something vitally important, at least for the tissues and organs in its immediate vicinity. As an example, if you didn’t have saliva glands you’d have nothing to spit. As it is, they are so active that the average human swallows between 1 and 1.5 liters of saliva every day. Fortunately, not all at once, from a big mug.