D. Oxygen
Central Nervous system (CNS)
The CNS is made up of the brain and spinal cord. This division of the nervous system controls the regulation of body systems as well as the processing and creation of memories.
Peripheral Nervous System (PNS)
The PNS is made up of all the neurons connecting the CNS to the rest of the body. The PNS sends messages from the body to the spinal cord and/or brain and back.
The PNS is divided into two sections:
The Autonomic Nervous System (ANS)
and the Somatic Nervous System (SNS). The ANS is involved with the unconscious control of body parts. That is the ANS controls all the body functions that takes place without us thinking about it. For example, the ANS controls our breathing, heart beat, blinking, and the digestion of food. On the other hand, the SNS is involved with the conscious control of the body.