The structure General Chemical Structure and Function of the Endocrine System of Animals The endocrine system consists of ductless vascular tissues that release a variety of hormones in regulated fashion. Endocrine hormones control or regulate a multitude of biological processes... read more , secretory patterns, and regulation Regulation of the Endocrine System in Animals Secretion of hormones is regulated by a system of sensing elements that can detect the need for both increased and decreased secretion. The particular sensing network, feedback elements, and... read more of endocrine hormones vary. New endocrine hormones continue to be discovered.