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Describe the histological nature of glands

Describe the histological nature of the glands? Also state how they are formed?

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The glands are epithelial tissues. They are made up of epithelium which throughout the embryonic development invaginated into other tissues.

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

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