Chapter 3 - Chapter 3: Synapses Synapse: a specialized gap...

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Chapter 3: Synapses Synapse: a specialized gap between neurons Reflexes: automatic muscular response to stimuli Reflex arc: sensory neuron excites second neuron, which excites a motor neuron and then a muscle o Spinal cord controlled flexion and extension o Reflexes are slower than conduction along an axon o Several weak stimuli at slightly different times or locations produce a stronger stimuli o When a set of muscles get excited another set must relax Sherrington concluded that communication between neurons slowed reflex response when compared to axon speed Graded potential: membrane potentials that vary in magnitude and do not follow the all- or-none law Temporal Summation: repeated stimuli within a brief period of time have a cumulative effect Spatial Summation: several synaptic inputs originating from separate locations combine their effects on a neuron EPSP: a graded depolarization of the postsynaptic cell; in most cases 1 EPSP doesn’t open enough Na gates to reach threshold
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This note was uploaded on 03/28/2008 for the course PSYCH 31:012 taught by Professor Inahlee during the Fall '07 term at University of Iowa.

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Chapter 3 - Chapter 3: Synapses Synapse: a specialized gap...

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