After discovering that the shadows outside his window were only the trees in the yard, Ralph's blood pressure decreased and his heartbeat slowed. These physical reactions were most directly regulated by hisa) somatic nervous system. b) sympathetic nervous system. c) parasympathetic nervous system. d) sensory nervous system.

Option C) parasympathetic nervous system.

Explanation:

The parasympathetic nervous system (PNS) dominates during normal relaxed periods. So, once Ralph recognized the same shadows as trees, he became relaxed. Thus, making his PNS to stimulate slow heartbeat, pupil constriction, decreased ventilation rate etc all associated with relaxation.

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