Final answer:
The brain uses a significant amount of energy to perform functions like thinking, reasoning, imagination, and memory, as well as regulate basic physical processes like breathing and heartbeat.
Step-by-step explanation:
The brain uses a significant amount of energy for various functions.
While the brain controls mental processes like thinking, reasoning, imagination, and memory, it also regulates basic physical processes such as breathing and heartbeat. The brain consumes about 25% of the total energy used by the body.