Exocrine glands.
Glands of the body are classified as either exocrine or endocrine types. Exocrine glands are glands that retain ducts to body surfaces. During development, endocrine glands lose their contacts to embryological surfaces(ducts) and become isolated as small blocks of tissues. Modes of Secretion. Secretory cells of exocrine glands release their products into ducts in three different ways. The mode of secretion can be classified as merocrine, apocrine, or holocrine. Cells that secrete products via the merocrine method form membrane-bound secretory vesicles internal to the cell. Endocrine glands have no ducts, but rather secrete their hormones directly into the bloodstream to produce effects in distant tissues. Groups of secretory cells are therefore situated near capillaries. The gland is surrounded by a connective tissue capsule, projections of which may extend into the gland as trabeculae. There are two major components of any exocrine gland: Parenchyma, which is the epithelial component of the gland consisting of the secretory units and ducts. Stroma, which is the connective tissue component of the gland (for support), as well as blood vessels and nerves. Endocrine and exocrine glands secrete various products. These include hormones, enzymes, metabolites, and other molecules. In exocrine glands, products of these cells collect in the duct of the gland and flow toward the surface to which the duct is in contact. Since endocrine glands lack ducts, the product is released across the cell membrane into interstitial spaces around the cells. Modes of Secretion. Secretory cells of exocrine glands release their products into ducts in three different ways. The mode of secretion can be classified as merocrine, apocrine, or holocrine. Cells that secrete products via the merocrine method form membrane-bound secretory vesicles internal to the cell. 3.Glands. 1  are epithelial structures which discharge a secretory product. 2  exocrine glands discharge their secretory product via a duct onto an epithelial surface. 3  endocrine glands secrete hormones directly into the bloodstream.  The major endocrine glands include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus, gastrointestinal tract and adrenal glands. The endocrine system is in contrast to the exocrine system, which secretes its hormones using ducts. For example the kidney secretes endocrine hormones such as erythropoietin and renin. A number of glands that signal each other in sequence are usually referred to as an axis, for example, the hypothalamic-pituitary-adrenal axis. Endocrine Glands. The secretions of endocrine glands are called hormones. Hormones are released into the interstitial fluid, diffused into the bloodstream, and delivered to targets, in other words, cells that have receptors to bind the hormones. The mesothelium is a simple squamous epithelium that forms the surface layer of the serous membrane that lines body cavities and internal organs. Its primary function is to provide a smooth and protective surface. Mesothelial cells are squamous epithelial cells that secrete a fluid that lubricates the mesothelium. Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands. The hypothalamus and pituitary gland are neuroendocrine organs. Local chemical messengers, not generally considered part of the endocrine system, include autocrines, which act on the cells that secrete them, and paracrines, which act on a different cell type nearby. The pancreas, located in the abdomen close to the stomach, is both an exocrine and an endocrine gland. The endocrine portion (islets of langerhans) releases insulin and glucagon and smaller amounts of other hormones to the blood. The body contains two types of glands: Exocrine glands secrete their products into ducts or directly onto. epithelial surfaces. Endocrine glands secrete their products called hormones, into the extracellular fluid around the secretory cells. 
http://mhhe.com/biosci/ap/histology_mh/glands.html http://www.iupui.edu/~anatd502/lecture.f04/epithelia.f04/Epithelial%20Tissue%2007.htm http://mhhe.com/biosci/ap/histology_mh/glands.html https://courses.stu.qmul.ac.uk/smd/kb/microanatomy/epithelia/index.htm https://en.wikipedia.org/wiki/Endocrine_system http://philschatz.com/anatomy-book/contents/m46048.html https://en.wikipedia.org/wiki/Endocrine_gland http://people.uncw.edu/pottsl/Anatomy%20and%20Physiology/lecture%20notes/Study%20Guide%2017%20-%20ENDOCRINE%20SYSTEM.doc
which kind of gland secretes hormones directly into an epithelial membrane