Which statement describes the nervous system's role in mental activity?

• A. It is the center of mental activity such as thought, learning, and memory.
• B. It stores calcium for bones.
• C. It filters impurities from blood.
• D. It transports oxygen to tissues.

Answer: (A)

Mental activity happens in the brain, which is the control center of the nervous system. Neurons form networks that process information, allow learning, and store memories. The cerebral cortex supports thinking and planning, while the hippocampus plays a crucial role in forming and retrieving memories. Because these processes underlie thought, learning, and memory, the nervous system’s role is to generate and coordinate mental activity through brain activity.

The other statements describe functions of different body systems: storing calcium for bones is a skeletal system function; filtering impurities from blood is a function of the kidneys in the urinary system; and transporting oxygen to tissues is a task of the circulatory system.