1) Peristalsis is the rhythmic muscle movement that helps to shuffle food and other molecules down the esophagus. This action is stimulated by the swallowing center in the brain. The muscles in vertebrates that allow this action to occur are called sphincters. Sphincters open and close according to whether the food should enter the stomach or esophagus. The esophagus is usually closed, except during swallowing and regurgitation.2) If “food goes down the wrong pipe,” this means that you have probably swallowed to quickly to allow your glottis to push against the epiglottis and therefore close off your respiratory tract and let food travel down your esophagus. This action is triggered by pressure on your pharynx which in turn sends electrical impulses to the motor neurons. 3) Pepsinogen needs a low pH to be active. In the stomach, where pepsinogen is found, HCl is the source of these H+ ions, but with an egg, I am not sure if hydrochloric acid
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