Temporal summation adds up postsynaptic potentials that
A) occur at the same time at different locations on the postsynaptic neuron.
B) are generated at regular intervals.
C) cause the same amount of depolarization in the axon hillock.
D) are generated at the same site in rapid sequence.
E) cause a hyperpolarization of the cell membrane.

Question

Quizplus · Accepted Answer

Temporal summation occurs when multiple postsynaptic potentials are generated at the same site in rapid succession, which adds up to produce a larger depolarization in the axon hillock. Therefore, choice D is the correct answer. Choices A, B, and C are incorrect because they do not involve rapid succession of postsynaptic potentials, and choice E is incorrect because hyperpolarization does not contribute to summation.

Temporal Summation Adds Up Postsynaptic Potentials That