To study whether an olfactory receptor neuron is activated by pyradine a researcher employs an imaging technique that utilizes a chemical indicator that glows green when exposed to ultraviolet light. if a decrease in the intensity of glow observed corresponds to an increase in ionic concentration in the olfactory receptor neuron in response to an odorant, which ion would this indicator chelate? choose 1 a. potassiumb. sodiumc. chlorided. calcium