Which organ system includes the brain and spinal cord?
A
Endocrine system
B
Circulatory system
C
Nervous system
D
Respiratory system
Correct Answer: Option C — Nervous system
Explanation:
The nervous system, comprising the brain, spinal cord, and peripheral nerves, controls and coordinates body functions by transmitting electrical and chemical signals. It regulates everything from reflexes to complex thought processes and voluntary movement.