Sensory input is the conduction of signals from sensory receptors. Sensory receptors are structures that detect changes in the external and internal environment due to stimuli. They detect stimuli such as light, heat, pressure, and chemicals.
Integration is the responsibility of the central nervous system, brain and spinal cord.
Motor output is the conduction of signals from the processing center to effector cell that carry out the body's response. Nerves that conduct in this way are grouped together in the peripheral nervous system. Evolution Neurons function in a similar manner throughout the animal kingdom, yet, each nervous system is diverse and unique. Hydra are among the least complicated animals in the animal kingdam. The nerve cells are evenly spread throughout the body.