Why do we burp and why can some people fake burp and some people can not????????????????

Question: Why do we burp and why can some people fake burp and some people can not????????????????
- Keywords:
  body function,
  burp,
  gas,
  human body
Asked by bambi to Daphne, Darren, Jon, Katherine on 21 Mar 2012. This question was also asked by gina08, 09jtaylor.
- Daphne Ng answered on 21 Mar 2012:
  
  We burp to release excess air that we have swallowed while eating and drinking. That’s why we burp when we drink fizzy drinks because we swallowed a lot of gases together with the drink.
  
  I myself cannot control my burps like some people can. So I don’t know how they can do it!

Question: Why do we burp and why can some people fake burp and some people can not????????????????