How many steps are described in the CNS process?

• A. Six steps
• B. Five steps
• C. Three steps
• D. Four steps

Answer: (B)

Information processing in the CNS happens through a sequence of stages from sensing to action. First, receptors detect a stimulus. Next, the signal travels along sensory pathways toward the central nervous system. Then the CNS interprets and integrates the incoming information. After that, a plan or decision is formed about how to respond. Finally, motor commands are sent to effectors to carry out the action.

This five-step view keeps the flow clear: detection, transmission, processing, decision, and execution. If you tried to fit everything into four steps, you’d merge one of these stages and lose clarity about how interpretation and planning fit in. If you split it into six, you’d be adding a level of subdivision that isn’t typically necessary for understanding basic CNS information processing.