Which network of nerve cells and fibers transmits nerve impulses between parts of the body?

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

Answer: (A)

The main idea is that the nervous system acts as the body's communication network, transmitting nerve impulses through a vast network of neurons and fibers that connect the brain, spinal cord, and all parts of the body. Neurons carry electrical signals along their axons and communicate at synapses, enabling sensing, thinking, movement, and reflexes. This rapid signaling system is what allows you to respond to touch, coordinate muscles, and process information from the environment.

The other systems don’t serve this signaling network in the same way: the musculoskeletal system provides structure and enables movement but doesn’t carry nerve impulses as a communication network; the endocrine system uses hormones released into the bloodstream to coordinate activities more slowly; and the circulatory system moves blood and substances around the body but isn’t the pathway for transmitting nerve impulses.