Neurotransmitters - biochemicals that send nerve impulses from one region of the brain to another - cause a person to feel a given emotionThe brain is a chemical factory that constantly produces neurotransmitters throughout our lives. The raw materials are amino acids, vitamins, minerals, and other nutrients. In a healthy body, neurotransmitter levels are constantly monitored and kept in check. However, the balance of these biochemicals is subject to many forms of disruption. Because neurotransmitters are comprised of several amino acid building blocks that are supplied through proper nutrition, poor diet-or poor digestion-can rapidly deplete some neurotransmitters, thereby increasing the level of others. In addition, medications as well as illicit drugs may decrease stores, often, resulting in severely elevated neurotransmitter levels which are often evident in urine. . The hormones produced Chemical neurotransmitters relay, amplify and modulate signals between a neuron and another cell. autonomic functions