Malcolm is studying alone in his room late at
night when he hears a loud noise downstairs. His heartbeat increases significantly and his breathing becomes shallow. He wonders if a burglar has entered the house and decides to investigate. When he gets downstairs, he discovers his cat has knocked over a plant stand. His body begins to relax and return to normal. Which part of his nervous system is responsible for returning Malcolm to a normal state?
a) spinal cord
b) somatic nervous system
c) sympathetic nervous system
d) parasympathetic nervous system
ANS: d
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