Mario hears his brother open the door, so he turns toward the door to say hello. Which best describes the signals moving through Mario’s nervous system to make him react and turn around?
Answer
A
The sensory nervous system sends a signal to the central nervous system, then the brain sends a signal to the somatic nervous system.
B
The autonomic nervous system sends a signal to the central nervous system, then the brain sends a signal to the sensory nervous system.
C
The sensory nervous system sends a signal to the peripheral nervous system, then the brain sends a signal to the autonomic nervous system.
D
The autonomic nervous system sends a signal to the peripheral nervous system, then the brain sends a signal to the somatic nervous system.
Explanation
Hearing the door is a sensory input: the sensory nervous system carries information to the central nervous system, which includes the brain. The brain then directs the voluntary movement of turning toward the door through the somatic nervous system. The autonomic nervous system controls involuntary functions, so it is not the pathway for this deliberate turn.
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