sentence2_structure: Most hormones<>are produced<>by the endocrine system
sentence1: Hormonal Disorders Chapter 143 Endocrine System and Hormones The endocrine system consists of a group of organs (sometimes referred to as glands of internal secretion) whose main function is to produce and secrete hormones directly into the bloodstream.
sentence2: Most hormones are produced by the endocrine system.
question: Most hormones are produced by which human organ system?