An example of a reflex arc is putting my hand on a hot stove, the stimulus is the heat, The receptors in your hand receive it then Send sensory neurons to the spine which when receiving sends relay neurons back to motor neurons going back towards the effector which makes your hand move off the stove. how the human growth hormone brings out a change in an organism is that it gives people their height. a similarity between the two methods of responding to an environment is that slowly they get used to to the change, whilst a difference is the fact that one is quite sudden whilst the other happens over time.