Involuntary, meaning things in the body such as your heart is all regulated to act unconsciously while also receiving directives from the brain.
Well, the food is in the environment. I would like to compare it with how bacteriae feed (however my biology is quite rusty), that is, they engulf their food and they "digest" -- not the proper term, since there are no organs to do real digestion -- it.
The axial skeleton consists of the skull, rib cage and vertebral column but her it looks like the appendicular skeleton
