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Which of the following is an example of spatial summation?Question 28Select one:a.Two stimuli from two sources produce graded potentials on the same neuron at the same time such that the two potentials sum.b.Two rapid stimuli from the same source produce graded potentials on the neuron that sum.c.An action potential occurs at the same time as a graded potential, and they sum.d.A neuron sends out information through collaterals to several target cells.e.Two action potentials occur at the same time and sum.

Question

Which of the following is an example of spatial summation?Question 28Select one:a.Two stimuli from two sources produce graded potentials on the same neuron at the same time such that the two potentials sum.b.Two rapid stimuli from the same source produce graded potentials on the neuron that sum.c.An action potential occurs at the same time as a graded potential, and they sum.d.A neuron sends out information through collaterals to several target cells.e.Two action potentials occur at the same time and sum.

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Solution

The correct answer is:

a. Two stimuli from two sources produce graded potentials on the same neuron at the same time such that the two potentials sum.

This is an example of spatial summation. Spatial summation occurs when multiple presynaptic neurons together release enough neurotransmitter (i.e., they fire) to exceed the threshold of the postsynaptic neuron. In other words, the postsynaptic neuron fires when it receives signals from multiple cells at the same time. This is different from temporal summation, which involves one presynaptic neuron releasing neurotransmitter many times in quick succession.

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