Board Thread:Naruto Discussions/@comment-33485854-20180916190847/@comment-31715856-20181107042927

Physical energy is draw from the body's cells. That image isn't showing the chakra network exactly, it's showing the path that one's physical energy is drawn from and merged with their spiritual energy (I presume the tendons in the image are the chakra coils). That's why Rasenshuriken prevents chakra from being created. The affected cells can no longer send physical energy to produce more chakra.