In the case study of Daniel who is a 62 year old man, became dizzy while working and fell and got a large laceration in his lower left leg (Chen et al., 2018). The injury can occur at any part in the body, like in the case study; Daniel got the injury in his left leg. It is the reaction of the immune system towards the injurious stimuli, for instance the bacteria, impaired cells, toxic composites, or irradiation, and functions by eliminating the harmful stimuli