Which statement describes the nervous system?

Which statement describes the nervous system?

• A. The network of nerve cells and fibers that transmits nerve impulses between parts of the body.
• B. The body's slow chemical communication system; a set of glands that secrete hormones into the bloodstream
• C. The body's skeleton and muscle system
• D. A system responsible for digestion

Answer: (A)

The nervous system is the body's fast signaling network. It uses specialized cells called neurons to transmit electrical impulses along pathways that connect the brain, spinal cord, and all nerves to every part of the body. This rapid communication enables sensing, reflexes, movement, and coordinated actions, as signals travel quickly to and from the central nervous system. The other systems described operate differently: the endocrine system communicates more slowly through hormones released into the bloodstream; the musculoskeletal system covers bones and muscles for structure and movement; and digestion handles breaking down food. The sharp, quick transmission of signals via nerve impulses is the hallmark of the nervous system.

The nervous system is the body's fast signaling network. It uses specialized cells called neurons to transmit electrical impulses along pathways that connect the brain, spinal cord, and all nerves to every part of the body. This rapid communication enables sensing, reflexes, movement, and coordinated actions, as signals travel quickly to and from the central nervous system.

The other systems described operate differently: the endocrine system communicates more slowly through hormones released into the bloodstream; the musculoskeletal system covers bones and muscles for structure and movement; and digestion handles breaking down food. The sharp, quick transmission of signals via nerve impulses is the hallmark of the nervous system.