Final answer:
The brain is the control center of the nervous system and controls mental processes and physical activities. The cerebrum is the largest part of the brain and is responsible for conscious, intellectual functions.
Step-by-step explanation:
The brain is the control center of the nervous system and of the entire organism. It controls such mental processes as reasoning, imagination, memory, and language. It also interprets information from the senses and controls voluntary muscle movement. In addition, the brain regulates basic physical processes such as breathing and heartbeat. The cerebrum, the largest part of the brain, is responsible for conscious, intellectual functions such as reasoning, language, memory, sight, touch, and hearing.