Read the following conversation.

Arun: Today, we learned that the central nervous system is made up of the brain and spinal cord. Did you know that even though the brain is only 2% of the total body mass, it uses 20% of the oxygen that we breathe in?
Dad: I didn't know that. What else did you learn?
Arun: We learnt that damage to the central nervous system can cause lots of different problems including difficulty concentrating and making decisions. Other signs of damage would be numbness and difficulties in moving the arms or legs.
Dad: It sounds like the central nervous system has some very important functions.

Briefly outline the basic functions of the central division of the human nervous system.
Refer to the conversation to support your answer.

The central nervous system (CNS), consisting of the brain and spinal cord, is the body's main processing centre. Its functions can be broadly categorised: 1. **Psychological Processes & Consciousness**: The brain is the seat of all conscious awareness, thoughts, memories, and emotions. The conversation links to this with 'difficulty concentrating and making decisions'. 2. **Control of Behaviour**: The brain and spinal cord control all voluntary and involuntary movements by sending nerve impulses to muscles. The conversation links to this with 'difficulties in moving the arms or legs'. 3. **Relaying Information**: The spinal cord relays sensory information from the peripheral nervous system to the brain and motor information from the brain to the body. The conversation links to this with 'numbness', which is a failure of sensory information transmission.