17. Which statement describes the events taking place if a nerve cell's membrane potential moves from -70mV to -60mV? O EPSP O inhibition O Cl- channels are likely opening O hyperpolarization
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This represents a change of +10mV. A positive change in membrane potential indicates depolarization. Show more…
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A neurotransmitter opens chloride (Cl-) channels on a postsynaptic neuron. Vm = -72 mV and ECl- = -85 mV in the postsynaptic neuron. Answer questions 17-19 about this neuron. 17. The Cl- channels opened by the neurotransmitter on the postsynaptic neuron are: a. leak channels b. aquaporins c. voltage gated channels d. ligand (chemically) gated channels 18. When the channels open, chloride: a. moves into the neuron b. moves out of the neuron c. there is no net movement of Cl- ions into or out of the neuron 19. The neurotransmitter is: a. inhibitory b. excitatory c. possibly glutamate d. possibly glycine e. b and c f. a and d
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The movements of Na+ and K+ ions across cell plasma membranes a. do not occur through leak channels b. is determined by the electrochemical gradient, diffusion and the Na+/K+ pump c. by diffusion through open channels, increases if the ion concentration gradient decreases d. occurs through closed gated-channels e. in excitable cells, ceases as soon as threshold is reached 2. The resting membrane potential becomes more negative (hyperpolarized) if a. Na+ permeability increases b. the extracellular K+ concentration increases c. Cl- permeability increases d. an EPSP is generated e. the intracellular protein concentration decreases 3. Excitatory post-synaptic potentials a. are produced by inhibitory neurotransmitters b. are associated with increased Na+ entry across the post-synaptic membrane c. decrease the probability that an action potential will fire in the post-synaptic neuron d. inhibit the generation of an action potential in the post-synaptic neuron e. are associated with an increase in Cl- entry into the post-synaptic membrane
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The cells from the same organism in the previous question are briefly exposed to a molecule that triggers the opening of ion channels that are selective for either chloride or potassium ions, but not both. The change in membrane potential in response to the molecule is shown below, where the gray bar indicates the duration of exposure. Based on this result, which statement is best supported? Note: A depolarization moves the membrane towards more positive or less negative values from its starting point; a hyperpolarization moves the membrane potential towards less positive or more negative values from its starting point. Add Molecule Membrane Potential (mV) -65 -75 -85 Time
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