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Unformatted text preview: September 11, 2007 Psychology 101 Terms and Concepts: Neuron Dendrite Axon Myelin sheath Action potential Synapse Neurotransmitters Endocrine system Hormones Camillo Golgi (1843-1926)-Accidentally knocks a block of brain into a dish of silver nitrate-Brain in dish lost for several weeks-Under the microscope, sees dark net-like blobs-only one in ten stained black (neuron) Greek 101 Soma body-ORIGIN late 19 th century: from Greek soma body Dendrite-ORIGIN early 18 th century: from French, from Greek dendrites treelike, from dendron tree. Axon-ORIGIN mid 19 th century (denoting the body axis): from Greek axon axis. Neuron-Using an electrochemical process, cells of the nervous system are specialized to carry messages-The human brain has about 100 billion neuronsmembrane surface area the equivalent of four soccer fields-neurons come in many different shapes and sizes-smallest neurons are only 4 microns wide whereas largest are 100 microns wide *1 micron = 1. x 10^-3-similar to other cells in body +cell membrane, nucleus with genes, cytoplasm, mitochondria, etc. +protein synthesis, energy production, etc.-differences to other cells in the body +specialized extensions called dendrites and axons-dendrites: bring information to the cell body (soma) and axons take it away from the cell body (soma) +myelin sheath speeds neural impulse +communicate with each other through an electrochemical process +have specialized structures (synapses) and chemicals (neurotransmitters) Ive Got It 1. What is the name of a nerve cell?1....
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