RT Book, Section A1 Ash, Rick A1 Morton, David A. A1 Scott, Sheryl A. SR Print(0) ID 1141045798 T1 ENDOCRINE SYSTEM T2 The Big Picture: Histology YR 2017 FD 2017 PB McGraw-Hill Medical PP New York, NY SN 9780071477581 LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=1141045798 RD 2024/04/18 AB In previous chapters of this book, we have discussed the structure and function of the cells, tissues, and organs that comprise the human body. Two organ systems have evolved that integrate and coordinate the activities of these components—the nervous system and the endocrine system. The key activity of both systems is signaling. Signaling by the nervous system is rapid and specifically targeted, whereas signaling by the endocrine system is usually slower and more wide ranging. The activities of the two systems are closely linked and complementary.