Freebase(0.00 / 0 votes)Rate this definition: Hydroelectricity. Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water.
Definition: Hormones. Hormones. Hormones are chemical substances that act like messenger molecules in the body. After being made in one part of the body, they travel to other parts of the body where they help control how cells and organs do their work. For example, insulin is a hormone that's made by the beta cells in the pancreas.
A hormone is a chemical substance produced in the body that controls and regulates the activity of certain cells or organs. These hormones are the messengers of the endocrine system, influencing such things as metabolic activity, reproduction, mood, growth and body development.It's interesting that the word hormone is derived from the Greek hormao meaning I set in motion or I stir up.This is exactly what hormones do. hormone is a chemical substance produced in the body that controls and regulates the activity of certain cells or organs. These hormones are the messengers of the endocrine system, influencing such things as metabolic activity, reproduction, mood, growth and body development.