When a body part is damaged it can be possible to repair or replace it. Inventive humans have been crafting artificial body parts since at least the days of Ancient Egypt! For most of our history the design and materials used to make body parts stayed much the same. Since the 20th century, however, engineers have greatly increased the variety and effectiveness of artificial body parts, using new materials and smarter design.
Engineers in this zone might be trying to grow new organs using stem cells, designing bionic arms that can outperform a natural one, or even developing whole exoskeletons that restore mobility to paralysed people.