question 95 which of the following statements accurately defines neuron? a. cells responsible for sending and receiving messages within the nervous system b. stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity c. subatomic particle of about the same mass as a proton but without an electric charge d. stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron