The word "响应" is formed by combining the character "响", meaning sound or echo, which is itself composed of "口" (mouth) indicating sound production and "向" (direction) suggesting sound projection, with the character "应", meaning to respond or answer, derived from "應" with elements historically associated with a committed reply. Together, these characters semantically merge to convey the concept of answering or echoing back, as in responding to a call or request.