The sebaceous and sweat glands associated with the skin are classified as glands because they release secretions to the skin's surface via ducts.

exocrine glands

Explanation: Exocrine gland secrete substances to an epithelial surface through a channel.

The sebaceous and sweat glands associated with the skin also secrete substance to skin surfaces via ducts/ channels and are classified as endocrine gland. There are two glands in the human body Exocrine gland and Endocrine gland.

Endocrine gland secrete substance into the bloodstream directly. Examples of exocrine glands are sweat, salivary, mammary, sebaceous, and mucous.

liver and pancreas are both exocrine and endocrine glands simultaneously.

As exocrine gland, the liver secrete bile and the pancrease secrete pancreatic juice into the gastrointestinal tract through channels. While as endocrine gland they secrete other substances directly into the bloodstream.

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