The human brain is made up of billions of neurons, specialized cells which form vast, intricate networks among themselves to process and sort through the barrage of sensory and internal stimuli we are constantly bombarded with and mediate the appropriate response. Neurons are long and thin, with numerous branches projecting from each end to allow communication with other neurons. When excited, an electrical impulse travels through the neuron and, when it reaches the far end, sends chemical messengers into the synapse, a narrow (microscopic) space between the sending and receiving neurons. These messengers then act on the receiving end of the neighboring neuron to either excite or inhibit it.
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