which of the following organ systems secrete hormones
11.1 Introduction. (p. 293). A. The endocrine system is made up of the cells, tissues, and organs that secrete hormones into body fluids. The body has two kinds of glands, exocrine (secretes products into ducts) and endocrine (secrete products into body fluids).11.2 General Characteristics of the Endocrine System. (p. 293; Fig.. The endocrine system is made up of the cells, tissues, and organs that secrete hormones into body fluids. The body has two kinds of glands, exocrine (secretes products into ducts) and endocrine (secrete products into body fluids). 11.2 General Characteristics of the Endocrine System.