Stedman’s Medical Dictionary defines emotions as “Feelings. A strong feeling aroused mental state, or intense state of drive or unrest directed toward a definite object…………” Emotions are feelings that can be difficult to assess, but emotions can affect behavior as well as produce physiological changes that can be measured. For example, a stressful situation can evoke the fight or flight response initiated by the sympathetic nervous system. This is a normal and essential response for survival. The response stimulates organs