The nervous system that controls respiration is called autonomic because it
a. uses nerves of the body.
b. deals with the exchange of gases.
c. conducts impulses.
d. isn't subject to voluntary control.

D. isn't subject to voluntary control. Autonomic nervous system controls function in the body that doesn't require conscious effort to occur. It means you cannot stop or start the process because it happens inside the body involuntarily. For example, even if you try to hold your breath, you'd only be able to do it for a while until your body signals or forces you to start breathing.