Which best describes the central nervous system?

Which best describes the central nervous system?

• A. It regulates hormonal release in peripheral glands only.
• B. It includes the brain and spinal cord and regulates both basic physiological processes and higher cognitive functions.
• C. It transmits messages solely from the brain to the body.
• D. It consists only of the brain.

Answer: (B)

The central nervous system is made up of the brain and spinal cord, and its job is to receive, process, and respond to information. It coordinates automatic bodily functions such as breathing, heart rate, and digestion through the autonomic system, while also handling higher-level tasks like thinking, planning, and memory. This combination—regulating basic physiological processes and supporting complex cognition—is why this description fits best. The other statements miss important parts: one focuses only on hormones, which is primarily the endocrine system; another says it transmits messages only from brain to body, ignoring that it also receives sensory information and processes it; and another says it consists only of the brain, ignoring the spinal cord.

The central nervous system is made up of the brain and spinal cord, and its job is to receive, process, and respond to information. It coordinates automatic bodily functions such as breathing, heart rate, and digestion through the autonomic system, while also handling higher-level tasks like thinking, planning, and memory. This combination—regulating basic physiological processes and supporting complex cognition—is why this description fits best. The other statements miss important parts: one focuses only on hormones, which is primarily the endocrine system; another says it transmits messages only from brain to body, ignoring that it also receives sensory information and processes it; and another says it consists only of the brain, ignoring the spinal cord.