Which organ system includes the brain and spinal cord?

• A. Neurological
• B. Cardiovascular
• C. Pulmonary
• D. GI

Answer: (A)

The brain and spinal cord are the central components of the nervous system, which controls and coordinates all body activities, processes sensory information, and directs responses. The term that best describes this organ system in the options is neurological, since it relates specifically to nerves and the nervous system. The other options refer to different systems: cardiovascular involves the heart and blood vessels; pulmonary relates to the lungs and breathing; and the GI system covers the digestive tract. So neurological is the right answer because it directly denotes the nervous system that includes the brain and spinal cord.