41 Animal Hormones. 41 Animal Hormones 41.1 What Are Hormones and How Do They Work? 41.2 How Do the Nervous and Endocrine Systems Interact? 41.3 What.
Animal Hormones
Hormones are chemical signals secreted by cells of the endocrine system. Endocrine cells: cells that secrete hormones Target cells: cells that have receptors.
