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 same cell (autocrine or intracrine signalling) or nearby cells (paracrine signalling).
A fen is one of the main types of wetland, the others being grassy marshes, forested swamps, and peaty bogs. Along with bogs, fens are a kind of mire. Fens are usually fed by mineral-rich surface water or groundwater.
What is Fenfluramine? Fenfluramine is an extremely dangerous drug that was once prescribed to patients in combination with Phentermine under the brand name Fen-Phen. Initially Fenfluramine was an obscure medication that was not prescribed to a large number of patients because they felt that they were unable to achieve lasting weight loss results.