The liver itself is a gland, specifically both an exocrine and an endocrine gland. It doesn't contain other distinct glands within its structure in the way that, say, the pancreas might contain islets of Langerhans.
Understanding the Liver's Dual Role
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Exocrine Function: The liver produces bile, an important substance for fat digestion, and secretes it into the bile ducts which eventually lead to the small intestine. This secretory function classifies the liver as an exocrine gland. [Reference: Your liver and pancreas are exocrine glands too. Your liver secretes bile through ducts into your gastrointestinal tract...]
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Endocrine Function: The liver also produces and releases various hormones and other substances directly into the bloodstream, fulfilling its endocrine role. [Reference: But your liver and pancreas are also considered endocrine glands. ]
The gallbladder, a small sac which stores bile produced by the liver, is closely associated with the liver but is a separate organ, not a gland within the liver. [Reference: The gallbladder, a small hollow pouch that sits just under the right lobe of liver, stores and concentrates the bile produced by the liver, which is later...]
Clarification
The original question, "Which gland is present in the liver?", can be interpreted in two ways:
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Are there other distinct glands inside the liver? The answer is no. The liver itself is the primary gland.
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What type of gland is the liver? The answer is that the liver is both an exocrine and an endocrine gland.
