If you are vomiting it does. But usually food doesn't go back into the esophagus because it tends to go down hill, going back into the esophagus is going against gravity.
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Also, the lower esophageal sphincter normally prevents stomach contents from flowing backwards. Sphincters are rings of muscle that open and close to control the flow in various places in the body.
The esophagus performs peristalsis, contraction of muscles to push food in a certain direction, in this case, toward the stomach. The stomach is also in a lower position from the esophagus , meaning that for food to get up, it would have to contend with gravity, and that the food is sitting t the bottom of the stomach, away from the exit of the esophagus. Also the esophagus has a valve that prevents food from moving out unless it needs it to.
There is a sphincter muscle that squeezes the esophagus closed unless someone is swallowing. Sometimes a problem occurs in which this sphincter does not close all the way, and stomach acid can come up the esophagus, causing burning and pain.
There is a structure at the entrance to the stomach called the esophageal sphincter, which can contract and seal off that opening, to keep food and digestive juices inside the stomach.
The sphincter .
lower esophageal sphincter
esophagus
Epiglottis.
Choking is caused by food or an item being stuck in the esophagus. Esophagus is the passage to the lungs and the stomach. So if food gets stuck in the esophagus, the lungs get blocked from receiving oxygen as well.
epiglottis
The epiglottis
To keep food from going into the lungs.
the epiglottis is the little flap that closes whenever you swallow to keep the food, water, spit, and whatever else you swallow from going into your lungs. It helps the digestive system because it keeps the things you eat and drink going down your esophagus (throat), which takes it to your stomach, and so on.
whats prevents food from going down your lungs
The esophagus is right behind the trachea, in line with it. In anatomical terms, both are located medially; neither is lateral to the other. The esophagus is dorsal or posterior to the trachea. The trachea is anterior or ventral to the esophagus.
Pulmonary semilunar valve
Burgers and fries in your lungs.
Trachea goes from the mouth to the lungs. Esophagus goes from the mouth to the stomach.
if you stop breathing due to blockages in the lungs or esophagus, then you cannot breathe, if you pass out, your natural body system kicks in and keeps you breathing.