Which system is responsible for signaling and coordinating body functions?

• A. Digestive system
• B. Nervous system
• C. Excretory system
• D. Skeletal system

Answer: (B)

The nervous system acts as the body’s signaling and control network. It uses neurons to send rapid electrical impulses and neurotransmitters to relay messages, coordinating actions across muscles, glands, and organs. This system processes sensory information from both inside and outside the body, then quickly directs responses—like moving a limb, adjusting breathing, or changing heart rate—to keep everything working smoothly. The central nervous system (brain and spinal cord) integrates information, while the peripheral nervous system connects the brain to the rest of the body. The other systems do vital jobs—digestion, waste elimination, and providing structural support—but they don’t carry the rapid, coordinated signaling that the nervous system provides.