Which organ is associated with the central nervous system (CNS)?

The correct association with the central nervous system (CNS) is the heart. The heart plays a critical role in regulating blood flow and oxygen delivery to the brain and spinal cord, which are primary components of the CNS. While the heart itself is not part of the CNS, it is intricately connected to it via the autonomic nervous system, which helps control heart rate and blood pressure in response to neural stimuli.

Understanding this relationship emphasizes the interconnected nature of different organ systems and their roles in maintaining homeostasis. Each organ interacts with the CNS in specific ways—for instance, the heart responds to signals that can influence stress and emotions, linking physiological states to neurological activity.