When Jenny saw that a large barking dog was enclosed by a very high fence, her racing heartbeat began to slow. The slowed heartbeat was most directly regulated by her

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The parasympathetic nervous system regulates the body's rest-and-digest response, which slows down the heart rate and decreases the perception of stress. This response is activated when the body perceives that it is safe and no longer in danger, such as when Jenny realized that the dog was enclosed by a high fence and could not harm her.

When Jenny Saw That a Large Barking Dog Was Enclosed