Hank fills us in on the endocrine system - the system of glands which produce and secrete different types of hormones directly into the bloodstream to regulate .\rbr\rbrPaul Andersen explains the major elements in the endocrine system. He explains how glands produce hormones which target cells. He differentiates between .\rbr\rbrHank begins teaching you about your endocrine system by explaining how it uses glands to produce hormones. These hormones are either amino-acid based .