The nervous system coordinates body activities through what?

• A. Muscle growth and metabolism
• B. Coordinates body activities through signals
• C. Circulation of blood
• D. Hormone secretion

Answer: (B)

The nervous system coordinates body activities through signals. It uses fast electrical impulses along neurons and chemical messages at synapses to relay information between the brain, spinal cord, nerves, and tissues. This rapid signaling lets the body respond quickly, control movement, process sensations, and regulate automatic functions like heart rate and digestion.

Other processes you might think of—muscle growth and metabolism, blood circulation, and hormone secretion—are governed primarily by different systems (endocrine for hormones and metabolism; cardiovascular for circulation). The nervous system often interacts with these systems, but its main role in coordinating activities is via neural signals that convey instructions quickly and precisely. For example, pulling your hand away from a hot object involves a rapid nerve impulse that bypasses conscious thinking to produce a swift motor action.