Local potentials:
A. Are either receptor or synaptic potentials.
B. Spread passively only a short distance along the cell membrane.
C. Result from stimulation of sensory receptors or from the binding of a neurotransmitter with chemical receptor sites on a postsynaptic membrane.
D. Both A and B
E. A, B, and C
ANS: E
Rationale: Local potentials are categorized as either receptor potentials or synaptic potentials, depending on whether they are generated at a peripheral receptor of a sensory neuron or at a postsynaptic membrane. These local potentials can only spread passively and therefore are confined to a small area of the membrane.
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