BIO 139

Chapter 13th "Endocrine" means internal secretion. A hormone has a half-life of 20 minutes. After an hour, ___ percent of the original number of molecules remains. 12.5 Upregulation of a target cell can occur in response to prolonged decrease in the level of a hormone. Cortisol stimulates the production of glucose from noncarbohydrates. The condition produced by factors that tend to cause changes in the body's internal environment and threaten its survival is called ______. Stress...