prostaglandin

Any of a group of potent hormonelike substances that are produced in various mammalian tissues, are derived from arachidonic acid, and mediate a wide range of physiological functions, such as control of blood pressure, contraction of smooth muscle, and modulation of inflammation.

Any of a group of naturally occurring lipids derived from the C20 acid prostanoic acid; they have a number of physiological functions and may be considered to be hormones.

a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity