Then, the epiglottis closes over the windpipe, effectively shutting off the flow of air. The rib muscles and the abdominal muscles suddenly contract, which causes the pressure to increase behind the epiglottis, which has closed. That pressure eventually causes the air to burst through and be expelled at a very high rate of speed, up to 100 mph.
Then, the epiglottis closes over the windpipe, effectively shutting off the flow of air. The rib muscles and the abdominal muscles suddenly contract, which causes the pressure to increase behind the epiglottis, which has closed. That pressure eventually causes the air to burst through and be expelled at a very high rate of speed, up to 100 mph.