The role of neutrophils during the inflammatory response includes: a. Divide to produce memory cells for future infection
b. Increasing the body temperature to produce a fever
c. Release perforin to target infected cell membranes
d. Producing plasma cells
e. Kill and engulf dead cells

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Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.