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'Fight or flight'

In an emergency, you breathe more quickly, your heart rate shoots up and you start to sweat. Your autonomic nervous system brings about this 'fight or flight' response by activating the sympathetic neurones. For our ancestors, this response was vital for survival but for us, it remains a reaction to stressful situations, like when we feel threatened or when we are being deceitful.

The autonomic nervous system enables animals to react in an emergency.
The autonomic nervous system enables animals to react in an emergency.
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