Hebrews 5:12 (Go to this verse :: Verse pop-up). In context, God tells us one of the purposes of His revelation to mankind. The writer of Hebrews scolds his audience for being dull of hearing (verse 11).
Prostaglandin activity is also intense but short lived, though the symptoms of the resulting inflammation continue for some time after prostaglandin release stops. Mast cells are the main source of prostaglandin synthesis and secretion. Epithelial cells (surface cells of the SKIN and mucous membranes) and platelets also produce as well as respond to prostaglandins.
Prostaglandins are known to regulate the female reproductive system, and are involved in the control of ovulation, the menstrual cycle and the induction of labour. Indeed, manufactured forms of prostaglandins - prostaglandin E 2 and F 2 can be used to induce (kick-start) labour. How are prostaglandins controlled? The chemical reaction that makes the prostaglandins involves several steps; the first step is carried out by an enzyme called cyclooxygenase.