Avaccine puts into the body weakened/dead pathogenic material, which by itself is incapable of causing disease. how does this to protect the body in the case of infection by a live pathogen?

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.