Why is it so difficult for humans to control their emotions when they feel in extremes?

Question: Why is it so difficult for humans to control their emotions when they feel in extremes?
- Keywords:
  emotion,
  extreme,
  human
Asked by anon-174145 to Yewande on 21 Jun 2018.
- Yewande Oyekenu answered on 21 Jun 2018:
  
  Our mood is controlled by signals sent to the brain with chemicals called serotonin. Serotonin via serotonergic neurons is responsible for our mood and putting us to sleep. We are able to control mood when these chemicals are expressed in the right amount

Question: Why is it so difficult for humans to control their emotions when they feel in extremes?