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Two main chemicals are responsible for the communication of the brain with the organs you have no conscious control over (heart, digestive system, endocrine system). The chemical norepinephrine helps your body get ready for a fightor-flight action by stirring up energy stores. In contrast, the chemical acetylcholine helps conserve energy by slowing the heart and increasing intestinal absorption.Which of the following situations is least likely to lead to increased levels of norepinephrine?

Explanation

Levels of norepinephrine rise when there is a potential for danger, stress, or excitement. The third choice, petting a rabbit, is the only choice that would tend to calm, rather than scare or excite, a person.

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