Definition: A hormone is a chemical substance produced in the body that regulates and controls the activity of certain cells or organs.
Etymology & Origin: The term ‘hormone’ comes from the Greek word ‘hormōn,’ meaning ‘to stimulate’ or ‘set in motion.’ It was coined in the early 20th century by English physiologist Ernest Starling.
Examples:
- Insulin is a hormone that helps regulate blood sugar levels.
- The thyroid gland releases hormones that influence metabolism, growth, and development.
- Hormones play a key role in processes such as mood regulation, growth, and reproductive functions.
