What is a gland that secretes hormones directly into the bloodstream called?

A gland that secretes hormones directly into the bloodstream is classified as an endocrine gland. Endocrine glands are specialized structures in the body that release hormones, which are chemical messengers, into the circulatory system. These hormones then travel to various organs and tissues, where they exert regulatory effects on processes such as metabolism, growth, and mood.

In contrast, exocrine glands release their secretions through ducts to the surface of an organ or tissue or into a body cavity. Examples of exocrine glands include salivary glands and sweat glands, which are not involved in hormone secretion but rather produce fluids like sweat or saliva.

A mixed gland contains both endocrine and exocrine functions, such as the pancreas, which releases digestive enzymes into the small intestine as well as hormones like insulin into the bloodstream. However, when specifically referring to the secretion of hormones into the bloodstream, the designation of endocrine gland is the most accurate.