Memory and basic emotions such as fear, anger, and sex drive are regulated by the limbic system, also called the emotional brain. Neurotransmitters have an essential function in the role of human emotion and behavior. They are chemical vehicles that provide synaptic transmission of messages from neuron to neuron or from neurons to muscle cells. Nurses interview patients to collect subjective data about their present health and any past medical experiences. In addition to present health status, past medical history, and family history, nurses ask patients about their self concept;interpersonal relationships, stressors, anger; and alcohol and drug use. Do you have any blood relatives who have behaviors that could indicate a mental health problem. I am going to ask you four routine questions about abuse that i ask all patients, because abuse and violence are common. In the last year how often did anyone: Notice the facial expression, eye contact, body language, and tone of voice of the patient.