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.
Fennel is an aromatic herb with a sweet anise or licorice flavor. Its taste is not very strong and the anise flavor is more aromatic. The herb is related to celery and it imparts a similar fresh-like flavor when eaten.