When the inside of your nose gets a tickle, a message is sent to the part of your brain called the sneeze center. The sneeze center sends a message to all the muscles that have to work together to create the sneeze. Those include the abdominal muscles, chest muscles, diaphragm, the muscles that control your vocal cords, muscles in the back of your throat, and your eyelid muscles. It's impossible to keep your eyes open when you sneeze.
The sneeze center makes all these muscles work in just the right order, to send that irritating particle out of your nose -- at speeds up to 100 mph, according to the Nemours Center for Children's Health Media.
About one of every three people sneezes when exposed to bright light; they are called photic sneezers. If you are a photic sneezer, you got it from one of your parents, since it is an inherited trait.
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