As Molly is walking across campus, a car swerves toward her. Her heart races and sweat breaks out as she jumps out of harm's way. This mobilization of energy is due to the action of Molly's
A) somatic nervous system.
B) skeletal nervous system.
C) parasympathetic nervous system.
D) sympathetic nervous system.
Answer: D
Rationale: The sympathetic nervous system is responsible for the fight-or-flight response of an increased heart rate, dilated pupils, and decreased salivary flow—responses that prepare the body for action. In contrast, the parasympathetic nervous system generally has the opposite effect on the body and conserves energy.
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