thenervoussystem - Psyc 001 Introduction to Psychology The...

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1 Psyc 001 Introduction to Psychology The Nervous System Neurons: Types and Functions ± Neurons – the basic cells in the nervous system ± Sensory ± Interneurons ± Motor neurons
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2 Structure of a Neuron ± Dendrites ± receive information from other neurons and transmit towards the cell body ± Cell body (Soma) ± Main “body” of the cell ± Metabolic center ± Genetic material stored here ± Axon ± extending fiber that conducts impulses away from the cell body and transmits to other cells. Transmits information ± Action potential travels down the axon to other neurons ± Terminal buttons on end Structure of a Neuron ± Myelin Sheath ± Fatty insulation that may surround the neuron’s axon. The Digital Archive ± Parts of a neuron ± The action potential
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About The Action Potential ± “All or None” ± Does not vary in strength or intensity ± Travels down the axon between 2 and 200 m.p.h. ± Speed increased if neuron is myelinated Neurotransmitters ± When action potential reaches the end of the axon, it triggers vesicles in the terminal buttons to release chemicals called neurotransmitters ± These activate receptors in the postsynaptic membrane ± May be excitatory or inhibitory How Neurons Communicate ± Axon terminals release neurotransmitter. ± Neurotransmitter enters the synapse . Tiny gap between the terminal buttons of one neuron and the dendrite of the next one. ± Neurotransmitter binds to
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This note was uploaded on 04/19/2008 for the course PSYCH 1 taught by Professor Hyland during the Spring '08 term at Lehigh University .

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thenervoussystem - Psyc 001 Introduction to Psychology The...

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