These chemicals are functioning in our brains to control our moods. Their proper function directs us to feel happiness of all kinds including the feelings of joy, accomplishment, reward, and kindness. However if they are malfunctioning they can lead us into life altering depression, anxiety and addiction. These chemicals are like a friend you used to have. At first they make you blissful until they betray you and cause you to be sad and miserable. The inner working of the brain is very complex and multifaceted. We can see how important it is that these chemicals work properly in our brains. They determine how we experience our very lives.