Final answer:
Both graded potentials and action potentials are types of electrical signals in neurons, with graded potentials being changes in membrane voltage in response to stimuli, and action potentials being rapid changes that propagate along the axon when a threshold is reached.
Step-by-step explanation:
The question at hand inquiries about which forms of neuronal signals constitute an electrical signal. Both graded potentials and action potentials are types of electrical signals in neurons. Graded potentials are temporary changes in the membrane voltage that can either depolarize or hyperpolarize the neuron based on the strength of the stimulus. These potentials can summate and, if they reach a certain threshold, they can initiate an action potential. Action potentials are the rapid, large changes in membrane potential that propagate along the axon and are crucial for neurotransmission. They occur when the graded potentials reach a threshold, triggering a sequence of ionic changes that result in the electrical impulse that travels down the axon. In conclusion, the correct answer is A) Both graded and action potentials, as both are integral components of neuronal communication and can be classified as electrical signals.