The strength of local electrical potentials is modulated and integrated via:
. Spatial summation, the combined effect of potentials generated in other parts of the neuron.
B. Temporal summation, the combined effect of small potential changes occurring over several milliseconds.
C. Both A and B
D. None of the above. A local potential is an all-or-none phenomenon.
ANS: C
Rationale: The strength of local potentials is increased, and the strength of multiple potentials is integrated via spatial summation and temporal summation. Spatial summation refers to the process of summing potentials generated in different parts of the neuron, whereas temporal summation refers to the adding together of small potentials that occur in a period of several milliseconds. If the summation of these local potentials reaches a specific threshold level, an all-or-none action potential is generated.
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