Exocrine gland (sectional schematic diagram)
Exocrine gland is a gland that secretes externally, usually composed of two parts: the gland surrounded by glandular epithelium and the excretory duct that excretes secretions, hence also known as ductal gland. It can be divided into single-cell glands and multicellular glands, and can also be called sweat glands, mucous glands, serous glands, etc. according to the type of secretion.
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