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GenPsychBiologicalPart2

GenPsychBiologicalPart2 - Lecture Outline Nervous system...

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Lecture Outline Nervous system cells. The synapse. Graded potentials. Action potentials. Neurons Neurons are cells that transfer signals within the nervous system. There are an estimated 100 billion neurons in the brain. Three classes of neurons: Sensory : Transmit input from sensory receptors to the brain. Motor : Transmit commands from the brain to the muscles and glands of the body. Interneurons : Interconnect neurons. Glia Glia support the neurons of the brain. Provide insulation. Remove waste products and foreign bodies. Recent research suggests their role may be more complex than previously thought. There are about 10 times as many glia as neurons. A glial cell is only about 1/10 the size of a neuron. Components of the Neuron: Functions Dendrites : receive stimulation from other neurons. Cell body : contains nucleus and other organelles. Axon : transmits an electrical impulse away from the cell body to terminate on another neuron, a gland, or a motor unit (group of muscle fibers).
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