![]() ![]() Some endocrine cells produce more than one active peptide hormone, in varying amounts. The original translation product (the prohormone) is usually processed proteolytically to yield the active hormone(s). insulin, prolactin) or the constitutive pathway (cytokines, growth factors). Proteins/peptides/glycopeptides (hydrophilic) are translated on the rough ER and secreted by either the regulated pathway (e.g. The endocrine system promotes survival of the species by: This is now known to be much too narrow a concept because hormones act via various routes: Hormones are normally present in very low concentrations (10 −12–10 −7M) in the blood/ extracellular fluid.Ĭlassical endocrine action is when a chemical messenger (the hormone), released by a cell, is transported, via the bloodstream, to its target cell. Hormones are chemical messengers released from a cell to influence the activity of another/the same cell via a receptor. Endocrinology is the study of the endocrine system. ![]() The endocrine system is one of the major control systems that use chemical messengers. ![]()
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