Indicate the effect of each of the manipulations listed below on the resting membrane potential of a typical neuron by writing D (for depolarization), H (for hyperpolarization), or NC (for no change) in the blanks. Write only one answer in each blank.
________ a. Exposure to a toxin that prevents voltage-gated K+ channels from opening.
________ b. Exposure to a toxin that prevents voltage-gated Na+ channels from opening.
________ c. An increase in permeability of the membrane to Ca2+ ions.
________ d. An increase in intracellular K+ concentration.
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