Sensation requires 1) stimulus Any change in the environment, either internal or external, can generate a stimulus. Example: body temp, pH, BP, light, sound. 2) receptor A structure which detects a stimulus and converts it into an action potential 3)impulse conducted The action potential is send via dendrites to the somas of sensory neurons in the CNS 4)translation The particular region of the CNs that receives the APs will convert them an awareness of the stimulus