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Digestive Journey

where food goes when you eat it

Grant Gorman

on 12 April 2010

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Transcript of Digestive Journey

Digestive Journey Have you ever wondered where Bread goes when you eat? It goes through a long maze of winding tubes and tunnels of your digestive system. I will use bread as an example for this journey. Pretend that you are a piece of bread. First thing that bread goes into is your mouth. You mouth has teeth that mechanicly grind food down. The saliva in your mouth comes from a set of glands called the salvary glands. That helps break down the food in your mouth to help it digest. If you suck on the bread, it will become sweeter because the sugar molecues are seperated. This is called the buccal phase. After you chew the food, you deglutition it. That is a facy word for swallow .When you swallow the bread, it starts to go down a tube called the esophogus. The first thing that occurs is the phanynx closes off the airway to your trachea so you don't choke. That allows the food to continue down the esophogus. This is the Pharyngeal-Esophageal phase. Its the phase that transports food down to the stomach. The esophogus is a long muscular tube that contracts to push food down it. The bread goes down untill it reaches the esophogal spincter. That is where the Esophogus attaches to the stomach at the cardioesophageal sphincter. Hey! Hows it going? Don't worry, i only look completly demonic and evil. In fact I am a really smart and nice smiley face. I just look this way because its cool. Im going to take you on a tour of the digestive system. Once the bread goes out of the esophagus, it goes in the stomach. The stomach is like a big sack of acid that breaks down the bread into its basic forms. The acid in the stomach is HCL or Hydrochloric acid. Gastric Juices are excreted to also help break down the bread. Sometimes, the cardioesophageal spincter doesnt close and acid goes up the esophagus. That is what heartburn is. When the bread is fully broken down in the stomach, the stomach mixes the chyme. The stomach squirts 3mL of chyme into the duodenum throught the pyloric spinctrer. The bread goes out of the stomach through the Pyloric spincter into the duodenum. Sometimes, bad food causes a reaction in the brain that causes Vomiting or reverse peristalsis. When the duodenum is full, the enterogastric reflex occurs. That cuts off the chyme from the stomach. When the bread enters the small intestines, it gets doused with pancreatic juice. That juice digests fats, carries protiens away and digests nucleac acids. The first section of the small intestines is called the duodenum. Here, the juices from the liver, pancreas and small intestines mix to contine to further break downt the bread. The bread then makes its 3 to 6 hour journey through the small intestines. Things like fat are absorbed by diffusion while every thing else is absorbed normally.
While traveling through the small intestines, the process of peristalsis is still occuring. That is the waves of contraction that propel food through the digestive tract. The bread goes out of the small intestines into the large intestines. The large intestines have no enzymes but it does have bacteria. The bacteria break down nutrients into vitamins. the large intestines absorb thoes vitamins. The bacteria create a gas that contributes to the smell of feces. That is what flatulence is. Usually, there is about 500ml of gas a day. Whent the bread is fully digested, it exits the body. It contains undigested bread, water, and mucus. That allows a smooth passage out of the Rectum. The process of expelling the bread or other food from the body is called Defication. That is the whole process. Its not that complicated though its rater disgusting. That last line isn't always true though. Sometimes it can be really painful............. FUN FACT! The appendix does nothing but get inflamed and infected! Its worthless!
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