Neural communication is the basis of human senses. Each nerve is made of neurons, microscopic units which look somewhat like sideways trees composed mainly of dendrites, axons, and axon terminals. Neurotransmitters are like chemical messengers that create signals between neurons to achieve some kind of reaction. The signals are perceived through an event called a synapse when the axon terminal of one cell touches another cell's dendrite end, sending electricity-like signals along the chain of neurons. These signals can increase or decrease a cell's functions according to the type of reaction felt. Unfortunately, neurons and neurotransmitters are very affected by drug use or disease. Drugs can interfere with comunication between neurons, can change the synapses, can bond to other neurotranmitters, altering the signals and changing the perception of feelings and senses of the human body. Some of this damage can even be permanent.
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