Positively charged sodium and potassium ions and negatively charged chloride

Positively charged sodium and potassium ions and

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Positively charged sodium and potassium ions and negatively charged chloride ions flow back and forth across the cell membrane, but they do not cross at the same rate. Resting potential (a tiny battery) The resting potential of a neuron is its stable, negative charge when the cell is inactive Action potential An action potential is a very brief shift in a neuron’s electrical charge that travels along an axon All-or-none law The neural impulse is an all-or-none proposition, like firing a gun. You can’t half-fire a gun. Same is true of the neuron’s firing of action potentials. Either the neuron fires or it doesn’t Absolute refractory period This is the minimum length of time after an action potential, during which another action potential cannot begin Only 1 or 2 milliseconds Presynaptic and postsynaptic neurons Postsynaptic potential Neurotransmitters and Behavior Acetylcholine
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Controls skeletal muscles (ACh): allows voluntary movement, attention, arousal, and memory Sleep paralysis Deterioration of ACh-producing neurons marks Alzheimers o Dopamine Controls voluntary movement
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  • Spring '08
  • Palfai

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