Sense organs connect a human body to the external environment by the means of five senses: vision, smell, taste, hearing and touch. These sense organs work in coordination with the nervous system. Hence, the central nervous system is responsible for sensing the external environments and responding accordingly. Each sense organ has specific receptors in the human brain that react to specific stimuli. For example: Receptors of vision, hearing, touch, smell and taste. These sensory receptors are connected with specific nerve endings that collect the stimuli from those sense organs.