All cells require energy to function and the general "currency" of energy
within the cell is ATP. Mitochodria are the "powerhouse" of the cell, respiration
produces both ATP and carbon dioxide.
Start by looking at the online textbooks. These links will give you an introduction to programmed cell death and some images of the process.
Next- more detailed online resources introduce key initiators, ATPs and pathways of cell death. Includes a link to a complete set of lecture slides on apoptosis.
Then- look at the signaling pathways that mediate programmed cell death.
Includes links to review articles and animations.Search NLM Online Textbooks- "ATP"
ATP, mitochondria,