Neuroscience Test 2 Vocabulary Ch 4

Neuroscience Test 2 Vocabulary Ch 4 - Colbie Cross...

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Colbie Cross Cross 1 Neuroscience 2-28-08 Test # 2 Chapter 4 Vocabulary 1.) Membrane potential - the difference in electrical charge between the inside and outside of a cell. 2.) Microelectrodes -extremely fine recording electrodes, which are used for intracellular recording. 3.) Resting potential - the steady membrane potential of a neuron at rest, usually about -70mV. 4.) Ions - positively or negatively charged particles. 5.) Ion channels -pores in the neural membranes through which specific ions pass. 6.) Sodium potassium pumps -active transport mechanisms that pump Na+ ions out of neurons and K+ ions in. 7.) Depolarize - to decrease the resting membrane potential.
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Colbie Cross Cross 2 Neuroscience 2-28-08 8.) Hyperpolarize - to increase the resting membrane potential. 9.) Excitatory post synaptic potentials (EPSPs) - graded postsynaptic depolarizations, which increase the likelihood that an action potential will be generated. 10.) Inhibitory postsynaptic potentials (IPSPs) - graded postsynaptic hyperpolarizations, which decrease the likelihood that an action potential will be generated. 11.) Graded responses - reponses whose magnitude is indicative of the magnitude of the stimuli that induce them. 12.) Axon hillock -the cortical structure at the junction between the axon and cell body. 13.) Threshold of excitation - the level of depolarization necessary to generate an action potential, usually about -65mV.
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Colbie Cross Cross 3 Neuroscience 2-28-08 14.) Action potential (AP) - a massive momentary reversal of a neuron’s membrane potential from about -70 to about +50mV. 15.) All-or-none responses - responses that are not graded, that either occur to their full extent or not at all. 16.) Integration - adding or combining a number of individual signals into one overall signal. 17.)
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This note was uploaded on 04/29/2008 for the course NEUROSCI 1306 taught by Professor Granados,keele,weaver,patton during the Spring '08 term at Baylor.

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Neuroscience Test 2 Vocabulary Ch 4 - Colbie Cross...

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