You come home one night to find a burglar in your house. your heart starts racing and you begin to perspire. these physical reactions are triggered by the nervous system.

The sympathetic nervous system is responsible for the reactions triggered on seeing a burglar. It is a part of the autonomic nervous system. The response triggered by the sympathetic nervous system is known as the 'fight-or-flight response'. This response is triggered in the situations of perceived threat, where the threat to one's survival occurs.

Hence, the answer is 'sympathetic nervous system'.

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