Why is the action potential necessary for the release of neurotransmitters? a) Voltage-gated K+ ion channels open and the K+ ion outflow causes neurotransmitters to diffuse across the synaptic cleft b) The influx of Cl- ions causes the synaptic vesicles to dissolve and release neurotransmitters c) Voltage-gated Ca²+ ion channels need to open, causing Ca²+ ion influx and fusion of the synaptic vesicles with the membrane releasing the neurotransmitter d) The K/Na ion pump maintains the resting membrane potential which causes neurotransmitters to move out of the cells through osmosis
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Step 1: The action potential is an electrical signal that travels down the axon of a neuron. Show more…
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An inhibitory neurotransmitter may cause the movement of which ion across the membrane? a) Na+ b) Mg2+ c) K+ d) Ca2+ Excitatory neurotransmitters produce which types of electrical responses in the postsynaptic neuron? a) Hyperpolarizations b) EPSPs c) IPSPs d) Threshold level inhibitions Neurotransmitters induce membrane potential changes: a) by opening voltage-gated Na+ channels on the postsynaptic axon hillock. b) on the presynaptic cell body. c) by opening mechanically-gated Mg2+ channels on the postsynaptic axon. d) on the postsynaptic dendrites and cell body
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The binding of an inhibitory neurotransmitter to the postsynaptic receptors of a neuron at its resting potential results in a. depolarization of the membrane. b. generation of an action potential. c. hyperpolarization of the membrane. d. increased permeability of the membrane to sodium ions. e. increased permeability of the membrane to calcium ions.
Neurotransmitters acting through a ionotropic mechanism ________. A. open ion channels present in the same molecule that has the specific receptor site for the neurotransmitter B. require a G protein for opening the ion channel C. act through second messengers D. require an enzyme in the membrane of the post-synaptic cell
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