Turning in at her street, Dominique saw six fire trucks in front of her apartment building. Her heart beat wildly until someone yelled, "Just a false alarm." Her pulse then began to return to normal, due to the action of her nervous system.

Parasympathetic is the correct answer.

Explanation:

her heart began to return normal because of the action of her Parasympathetic nervous system because the Parasympathetic nervous system's role is to conserve energy because it decreases the heart rate and respiration.

The Parasympathetic nervous system is responsible for the digestion response when the body is in the state of relaxing, feeding,resting, and body rest, and it also regulates urination, digestion, sexual arousal, and defecation.

it would lead to upper respiratory infections and pneumonia.

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