what system produces chemical signals called hormones?
GENERAL CHARACTERISTICS OF THE ENDOCRINE SYSTEM. FIGURE 17.1. 1. The endocrine system consists of glands that secrete chemical signals, called hormones, into. the blood. In addition, other organs and cells beside the glands seen in figure 17.1 secrete. hormones. For example, organs of the digestive system secrete hormones that function to. regulate the digestive process. 2.