Which system includes the brain and spinal cord?

• A. Respiratory system
• B. Circulatory system
• C. Nervous system
• D. Endocrine system

Answer: (C)

The nervous system is the correct choice because it is primarily responsible for processing and transmitting information throughout the body. It includes the brain and spinal cord, which are the central components of the system. The brain acts as the control center for the body, overseeing functions such as thought, emotion, and coordination of bodily processes. The spinal cord serves as a major pathway for transmitting signals between the brain and the rest of the body, playing a critical role in reflexes and motor control.

In contrast, the respiratory system is responsible for gas exchange, the circulatory system transports blood and nutrients, and the endocrine system regulates hormones and metabolic processes. Each of these systems serves distinct functions that do not involve the processing and coordination of information, which is the primary role of the nervous system.