system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How does a sneeze work? Like, how exactly is it triggered, and what happens during a sneeze?
gpt
A sneeze is how the body clears obstructions and irrititants from the nasal passage. The cells lining your nasal passage have tiny little hair-like structures called cilia. Whenever enough of these structures are bent or irritated they will send a signal to your brain that the nose needs cleared. Moments before the sneeze your chest muscles tighten and your throat closes for an instant. This creates a slight buildup of pressure in your lungs. The throat releases a moment later and the daiphragm (the muscle that compresses your lungs) spasms to force the air up. This also propels a lot of droplets up through the nasal passage. The rapid air combined with the droplets of saliva pick up and force the thing that caused the sneeze out.