Asingle action potential is described as a single action potential is described as graded by the functional area involved not graded graded by the frequency of the stimulus graded by the intensity of the stimulus

A single action potential is described as not graded.

Explanation:

Action potentials are the response of the post synaptic neuron. If the response is simple, then it is known as the single action potential. Such action potentials can be described with only one characteristic. The one feature of these action potentials is it's latency. The single action potential are generally not graded also.

But mostly the action potentials are not so simple and are not the single action potential. The action potential are generally more complex and consist of several action potentials.

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