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.
Main Ingredients. The weight-loss drug Fen Phen consists of two diet drugs, fenfluramine and phentermine. Fenfluramine releases additional amounts of the seratonin neurotransmitter to the brain to create an artificial feeling of fullness. Phentermine is a stimulant that promotes weight loss by suppressing the appetite.