Which system regulates and controls all body systems?

• A. Respiratory System
• B. Nervous System
• C. Adrenal Gland
• D. Skin System

Answer: (B)

Coordinating and controlling all body activities relies on processing information, integrating signals from the senses, and sending rapid commands to organs. This is the nervous system, with the brain and spinal cord orchestrating responses and the autonomic nerves regulating heart rate, digestion, respiration, and more. It acts as the primary regulator that keeps systems in sync and responds quickly to changes. The respiratory system handles gas exchange, not the overall control of every function. The adrenal gland releases hormones that influence metabolism and stress responses but doesn’t govern all systems. The skin provides protection and helps with temperature regulation and sensation but doesn’t regulate overall physiology. Hormones and other tissues modulate activities, but the nervous system remains the central controller of body-wide regulation.