Which system transmits nerve impulses between parts of the body?

• A. Endocrine system
• B. Nervous system
• C. Musculoskeletal system
• D. Digestive system

Answer: (B)

The nervous system is responsible for transmitting nerve impulses between parts of the body. Nerve impulses are electrical signals produced by neurons that travel along an axon and cross synapses to other neurons, muscles, or glands, allowing rapid sensing, processing, and responses. This system, which includes the brain, spinal cord, and a vast network of nerves, coordinates everything from reflexes to voluntary actions. In contrast, the endocrine system communicates mainly through hormones released into the bloodstream, which is generally slower and affects many parts of the body at once. The musculoskeletal and digestive systems have other primary roles—structure and movement, and processing nutrients, respectively—rather than carrying nerve impulses. Therefore, the nervous system is the one that transmits nerve impulses between parts of the body.