Coordination between different organs and systems of the body by chemicals or hormones is called chemical coordination. There are three types of chemical combinations found in the human body. namely-
1. Endocrine Coordination: Hormones secreted from endocrine glands are transported by blood to various cells and coordinate.
2. Paracrine coordination: Chemicals secreted from cells are carried by a fluid to reach other cells and coordinate.
3. Autocrine regulation: Chemicals secreted by the same cell affect the function of that cell.