Imagine your left hand is hurting. That does not mean that your right hand is hurting. Even in your left hand, if one finger is hurting, the other finger can be perfectly normal.In other words, these different body parts are independent of one another. One part can function without the other part.What is the smallest independent functioning part of our body? That is, what part of the body can perform a set of functions on its own. We will learnt about it in this Chapter.