a) the respiratory system (lungs)
b) the innate law of living things (innate intelligence)
c) the endocrine system (a complex network of glands and organs that produce and regulate hormones)
d) the central nerve system (brain & spinal cord)
e) the circulatory system (heart, arteries, veins, and capillaries)
The correct answer is b) the innate law of living things.
All the parts of the body are important. The central nerve system is probably the most important and may appear to be the focus of chiropractic.
However, even a corpse has a brain and spinal cord. What is missing is the expression of the innate law of living things.
As you know, the innate law of living things is described as the inborn organizing principle governing the body of a living thing through adaptation in order to maintain it alive. It causes a living organism to organize and reorganize its physiology in order to adapt and survive in an ever-changing environment. It is expressed in all parts of the body, but uses the central nerve system as its primary tool to communicate to the rest of the body. For this reason, we try to make sure the nerve system is free from interference.
Regular chiropractic checkups and adjustments (when needed) will make sure the nervous system is clear and the innate law of living things is being expresses as best as possible.