What does the central nervous system consist of?

The central nervous system (CNS) is primarily made up of the brain and the spinal cord. This system is crucial for processing and transmitting information throughout the body, controlling functions such as movement, sensation, and reflexes. The brain serves as the control center for thought, emotions, and coordination, while the spinal cord acts as the main pathway for information traveling between the brain and the rest of the body.

In contrast to the correct answer, the other choices include organs that do not function as part of the CNS. For example, lungs are part of the respiratory system, and the liver is involved in metabolic functions. The heart is essential for circulation but falls under the cardiovascular system. Understanding the components of the central nervous system helps clarify its role in maintaining bodily functions and coordinating responses to various stimuli.