Exocrine glands are tubes (often complexly-branched) of cuboidal or columnar epithelium that bud off a surface. Their acini are the business units that do the secreting; branching ones have ducts that bring their secretions to the surface from which the gland budded during embryonic life.
Exocrine glands look like rings of cuboidal or columnar epithelium, grouped together.
Usually they will display the lumen into which their product is secreted.
This is a bit of mucus-secreting exocrine gland.
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