Bayliss, Sir William (1860-1924), an English biologist, helped discover hormones. Hormones are chemical substances that regulate many body functions. Bayliss specialized in physiology, the study of life functions, such as digestion. In 1902, he and another physiologist, Ernest Henry Starling, became the first scientists to find a hormone, which they named secretin. Secretin is produced in the small intestine, and it stimulates the pancreas to secrete digestive juices. This discovery led Bayliss and Starling to recognize how hormones functioned. In 1905, Starling coined the term hormone, which comes from a Greek word meaning to set in motion.