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Histological nature of glands

Write down the histological nature of glands? How are they formed?

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The glands are epithelial tissues. They are made of the epithelium that throughout the embryonic development invaginated in other tissues.

In the exocrine glands the invagination has preserved secretion ducts. In the endocrine glands the invagination is complete and there are no secretion ducts.

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