Test Banks Chapter 11, Exercises of Advanced Education

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The neuron cannot respond to a second stimulus, no matter how strong. - Absolute refractory period The interior of the cell becomes less negative due to an influx of sodium ions. - Depolarization The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. - Repolarization Also called a nerve impulse transmitted by axons. - Action potential An exceptionally strong stimulus can trigger a response. - Relative refractory period Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect. - Temporal summation Stimulation of a postsynaptic neuron by many terminals at the same time. - Spatial summation An insufficient stimulus. - Subthreshold stimulus Any stimulus below this intensity will result in no response in a neuron. - Threshold stimulus Area where nerve impulse is generated. - Trigger zone Receives stimuli. - Receptive region Plasma membrane exhibits voltage-gated Na+ and K+ channels. - Conducting region Plasma membrane exhibits voltage-gated Ca2+ channels. - Secretory region Axon terminals release neurotransmitters. - Secretory zone Plasma membrane exhibits chemically gated ion channels. - Receptive region One incoming fiber triggers responses in ever-increasing numbers farther and farther along the circuit.