Hello everyone and welcome to Mr. Doe's tour of the gastrointestinal tract. Today we're going to take a ride alongside the very unhealthy food he'll be consuming in a few minutes, like a hamburger, fries, and a root beer. Over the next few minutes, please take a moment to look at the images of each structure on the flyer located on the back of the seat in front of you. The digestive system consists of the digestive tract called the alimentary canal which forms a continuous path from the mouth to the anus. I hope everyone is hooked and excited to see the different digestive system structures located in Mr. Doe's body today! Ladies and gentlemen, hold on tight while Mr. Doe takes a bite of his burger in just a few seconds. We have just arrived at Mr. Doe's mouth. As you can see, the burger and fries are broken into small pieces with each chew so that they can be easily digested. During this process, saliva mixes with the food so that the body can absorb and use each carbohydrate, fat and vitamin in various places such as the bloodstream for example. I'm sure the taste buds allow Mr. Doe to enjoy this disgusting and juicy burger! The taste buds are located near the back of the tongue, but if you want me to get technical with words, they are located in the posterior lateral area of ​​the tongue! I can bet some of you didn't know that our tongue helps with chewing, swallowing, and ingesting food while also helping to clean our teeth. I know! Very weird, right? Instantly we will start speeding towards the digestive tract and colliding with various juices which actually contain enzymes. The digestive tract is a long tube approximately 8 to 10 meters in length...... middle of paper ......m. The ileum and jejunum are coiled structures. The ileum contains villi and microvilli that actually increase the surface area for digestion and absorption of food. The three sections of the small intestine have tube-shaped glands in their walls that secrete juice into the intestinal lumen. This secreted juice helps crush food and mix it with other juices. This process helps it move towards the large intestine which we are very close to. The small intestine absorbs most nutrients. Ironically, the large intestine is shorter and wider than the small intestine. It looks like we're going to take a detour to the mucous membrane. The mucous membrane, simply put, is our own personal air filter. When it works properly, it takes the air we breathe and cleans, warms and humidifies it. It is also one of the body's first-line defense systems..