An imbalance of which type of naturally occurring substances in the brain is thought to be responsible for depression?

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Depression is an illness characterized by feelings of sadness,despair,loss of energy,and difficulty dealing with normal daily life.Research suggests that depression may be caused by an imbalance of brain chemicals called neurotransmitters (e.g. ,serotonin,dopamine,and norepinephrine).Communication between neurons in the brain occurs by the movement of these chemicals across a small gap called the synapse.Neurotransmitters are released from one neuron at the presynaptic nerve terminal and then cross the synapse,where they may be accepted by the next neuron at a specialized site called a receptor.When neurotransmitter levels decrease or become imbalanced,the neurons may be less able to communicate with each other,which may lead to depression and other mood changes.

An Imbalance of Which Type of Naturally Occurring Substances in the Brain