The alarm reaction to danger that is triggered by anxiety primarily involves the nervous system.

Sympathetic

The alarm reaction to danger that is triggered by anxiety primarily involves the sympathetic nervous system

Explanation:

The sympathetic nervous system (SNS) primarily stimulates many parts of the body for action in times of danger or emergency situations.

During this process, a hormone known as adrenaline (the emergency hormone) would be released, and effects such as sweating, increased heartbeat, raised blood pressure will follow.

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