sentences: regulation is when an organism maintains a stable internal environment & the amount of sugar in blood is a part of an animal 's internal environment ->  an example of regulation is controlling the amount of sugar in an animal's blood  if something releases something else then that something is the source of that something else & the endocrine system is a source of hormones ->  the endocrine system releases hormones  the endocrine system releases hormones & hormones regulate body functions ->  hormones are released to regulate body functions  hormones are released to regulate body functions & an example of regulation is regulating body functions ->  hormones are released for regulation  hormones are released for regulation & insulin is a kind of hormone ->  insulin can be released for regulation  an example of regulation is controlling the amount of sugar in an animal's blood & insulin can be released for regulation -> an example of regulation is insulin being released to control the amount of sugar in blood