Name one or two diseases that affect each of these body systems: • Respiratory:
• Digestive:
• Nervous:
• Circulatory:
• Musculoskeletal:

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.

The direction a chemical reaction occurs is represented by an arrow