Which is a primary function of the nervous system?

Which is a primary function of the nervous system?

• A. Sensory (gather info)
• B. Hormone production
• C. Blood filtration
• D. Digestion

Answer: (A)

The nervous system acts as the body's information network. Its primary function is to gather information from both inside and outside the body through specialized sensory receptors, transmit that data to the brain and spinal cord, and coordinate the resulting actions. This sense-driven input—like detecting touch, sound, light, temperature, body position, and internal states such as hunger or heartbeat—provides the data the system uses to decide how to respond, such as moving muscles or adjusting organ activity. That sense-and-respond role is why gathering sensory information is the best answer. Hormone production belongs to the endocrine system, blood filtration to the kidneys, and digestion to the digestive system. The nervous system can influence these processes, but its core job is sensing, processing, and directing responses based on those sensations.

The nervous system acts as the body's information network. Its primary function is to gather information from both inside and outside the body through specialized sensory receptors, transmit that data to the brain and spinal cord, and coordinate the resulting actions. This sense-driven input—like detecting touch, sound, light, temperature, body position, and internal states such as hunger or heartbeat—provides the data the system uses to decide how to respond, such as moving muscles or adjusting organ activity. That sense-and-respond role is why gathering sensory information is the best answer.

Hormone production belongs to the endocrine system, blood filtration to the kidneys, and digestion to the digestive system. The nervous system can influence these processes, but its core job is sensing, processing, and directing responses based on those sensations.