Reflex pathways are neural circuits that enable quick responses to stimuli without the need for conscious thought. When a sensory receptor detects a stimulus, it sends signals through sensory neurons to the spinal cord, where they connect with interneurons. These interneurons then activate motor neurons, which trigger a response in muscles or glands. This process allows for rapid reactions, such as pulling your hand away from a hot surface. The entire pathway, from sensory input to motor output, is designed to protect the body and maintain homeostasis, demonstrating the efficiency of the nervous system in responding to immediate threats.