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Unformatted text preview: 1-23-08Chapter 3: Drugs and the Nervous System•Most drugs have effects on neurotransmitters•All psychoactive drugs produce their effects by acting on nervous system tissue•Some drugs may act by mimickingNeurons•A unique type of cell that can receive and transmit information electrochemicallyBasic Neuron Types•Bipolar (interneuron)•Unipolar (sensory neuron)•Sensory neurons carry information from sense organs to the central nervous system (CNS)•Neurons in the CNS process that information, interpret it, and then send commands to muscles•12-15 billion neurons in cerebral cortex•1 billion in spinal cord•Human nervous system has nearly 100 billion neurons•They aren’t the only type of cell in the system.Glia•Cells that support the neurons in many ways•They provide insulation and remove waste products and foreign bodies•They are 1/10ththe size of neurons, but about 1- times as numerous....
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- Spring '08
- sensory neurons