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Neurons & Transmission of Information •Neuron = specialized cell that conducts impulses (sends messages) through the nervous system •contains 3 major parts--cell body, dendrites, & an axon –Cell body = contains the nucleus & carries out the metabolic (life-sustaining) functions of the neuron –dendrites = receivers of signals from other neurons (look like tree branches) –axon = tail-like extension of the neuron that transmits signals to the dendrites or cell body of other neurons or to the other muscles or glands –myelin sheath = fatty coating wrapped around some axons that acts as insulation & enables impulses to travel much faster •Note: neurons are not connected to each other--separated by tiny, fluid-filled gaps called synaptic clefts •Synapse = junction where the axon terminal of the sending neuron communicates with a receiving neuron across the synaptic cleft •Neurotransmitters = chemical that is released into the synaptic cleft from the axon terminal of the sending neuron, crosses the synapse, & binds to appropriate receptor sites on the dendrites or cell body of the receiving neuron & influences the other cell •receptor site = site on the dendrite or cell body of a neuron that will receive only specific neurotransmitters •variety of neurotransmitters = regulate actions of glands, muscles, learning, memory, sleep, emotions, relief from pain, etc. •Two types of neurons: –A sensory neuron is a nerve cell that relays impulses from a receptor such as those in the eye or ear to a more central location in the nervous system. •Also known as _________________________ –A motor neuron is a nerve cell that sends impulses from a central area of the nervous system to an _________________ such as a muscle •Also known as ______________________