Behavior is defined as the way in which a person acts or behaves, particularly towards others. Behavior is controlled by a system in the body called the endocrine system. The endocrine system is made up of glands whose secretions pass directly into the blood or lymphatic system. This system is responsible for growth, mood, tissue function, metabolism, sexual function and reproductive processes. The endocrine system affects almost every organ and cell in the body. Hormones and glands make up this system. As with any system, diseases dangerous to the body can occur. Hormones constitute one of the major elements of the endocrine system. They are released from endocrine tissue into the bloodstream. When hormones travel through the bloodstream, they target a tissue where they will trigger a response. Endocrine glands, which are a special group of cells, make hormones. Endocrine glands generally do not have ducts and are vascular. The kidneys, heart and liver help secondary endocrine systems. A small hormonal change can lead to big changes in the body and in the cells. If there are too many or if...