A hormone is any member of a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour. Hormones have diverse chemical structures, mainly of 3 classes: eicosanoids, steroids, and amino acid/protein derivatives. The glands that secrete hormones comprise the endocrine signaling system. The term hormone is sometimes extended to include chemicals produced by cells that affect
The use case model consists of two artifacts: the use case diagram, which is a graphical representation showing which actors can operate which use cases, and the use case description (sometimes called the use case narrative), which is the text-based, detailed, step-by-step interactions and dialogue between the actor and the system.
Many people with a history of mental illness have a complex array of needs that must be considered. Case management is one of the major types of community aftercare that is used to provide ongoing management of chronic or recurring illness. Active case management is especially important for people who have been repeatedly hospitalised for mental illness. Too often these people experience a 'revolving door', a recurring pattern of discharge and re-admission to hospital because they are not adequately supported in the community.