Question

Temporal summation refers to

A) the temporal lobe of the brain integrating neuronal interaction.
B) multiple graded potentials originating from different locations simultaneously.
C) additional graded potential(s) arriving before previous ones have ceased.
D) suprathreshold potentials triggering action potentials that are extra large.
E) All of the above accurately describe temporal summation.

Answer 1

Temporal summation is the process where multiple graded potentials occur at the same location in a neuron over time, potentially leading to an action potential if they summate sufficiently.

Step-by-step explanation:

Temporal summation refers to additional graded potential(s) arriving before previous ones have ceased, which can lead to the neuron reaching threshold potential and the initiation of an action potential if the combined changes summate sufficiently.

Unlike spatial summation, which involves graded potentials occurring at different locations across the neuronal cell membrane, temporal summation involves potentials that accumulate over time but in the same location. The process is critical in the neuron's ability to process and transmit signals effectively. When multiple excitatory postsynaptic potentials (EPSPs) overlap in time at the axon hillock, it can increase the membrane depolarization to a level that triggers an action potential in the neuron, efficiently relaying the signal.