Читать книгу Essential Endocrinology and Diabetes - Richard I. G. Holt - Страница 25

An elementary control system is one in which the signal itself is limited, either in magnitude or duration, so as to trigger only a transient response. Certain neural impulses are of this type. Responsiveness of the target cell is set to discriminate between a positive signal, when a cell responds, and background ‘noise’, when a response is not triggered. An example is the pulsatile release of gonadotrophin‐releasing hormone (GnRH) from the hypothalamus.