The digestive system is categories into two separate groups, these groups are called the alimentary canal, and the accessory digestive organs. The major processes of the alimentary canal include, ingesting which is consuming any type of substance our body is able to swallow, digesting the breaking down of any dissolvable material and absorbing the chemical compounds in that substance in the lower part of our digestive system, absorption which is the act of being distributed into another object thus helping said object or organism in this case, and finally defecation the process of which digested materials are removed from the body in forms of bodily waste. The Alimentary organs, are all hollow and muscular tubes and are the two open ends of the body. Meaning the whole Alimentary system is practically one long tube starting from your mouth and ending with large intestine which leads you to the ending of the digestive process, the anus. The second part of the digestive system are the accessory organs which include the teeth, tongue, and the esophagus, the liver, gallbladder, stomach, pancreas, spleen, and the small and large intestines, thus finishing with the anus.
Imagine you are eating a slice of a Pizza hut pizza, with tomato sauce, pepperoni slices, cheese, and of course the crust and pizza slice. To begin the digestive process you put the piece of pizza in your mouth, which is the beginning of the digestive process. That slice of pizza is greeting by your teeth, which are used to rip and tear the materials off the pizza. You have multiple different types of teeth for this reason. And your lips are used to protect these delicate bones of the face and also blocking the opening of your mouth to prevent food from spilling out of your mouth as well as saliva when you are chewing food, and drinking a substance. When food enters the mouth it is also mixed with saliva and is masticated, or in casual terms it is chewed, you will be greeted by multiple types of tastes due to the wonderful discovery of our papillae other wise known as our taste buds which are located on the surface of your tongue and after you are greeted with these wonderful tastes Your tongue instinctively pushes those chunks chewed off and torn from the slice of pizza after it is continuously mixed with the saliva in your mouth then once you have chewed enough and your food is small enough your tongue with push the food, or in other words swallow and push your food down to your soft, palate, and uvula, which will trigger a swallowing motion. Once it is touched by the piece of food your tongue has pushed back. Thus instinctively causing your epiglottis to contract causing the swallowing motion.
Once your food has been swallowed and is no longer in the oral cavity, your mouth, your food passes into the pharynx which consists of two layers oropharynx and the laryngopharynx, common pathways for foods fluids and air to travel in our bodies. The oropharynx is posterior to the oral cavity, or mouth, while the laryngopharynx is continuous with the esophagus below. The pharynx uses these two layers of muscle to push and swallow are food and pushing it down into our esophagus. The pharynx is why we are able to still swallow while we are upside down.
Once the pizza has passed the pharynx the food is then transferred and pushed down into the esophagus which runs from the pharynx down the diaphragm, or the lower part of your lungs, to the stomach. The esophagus mainly consists of many codependent parts mainly four. Which include the mucosa, the innermost layer that lines the lumen, basically lining the outside of the organs. It is a smooth muscle layer to avoid the pizza from causing friction so the digestion process so the process isn’t a painful ordeal, it is one of the more simple digestive organs. The submucosa just beneath the mucosa, a soft layer of connective tissue which is found consisting of mainly blood vessels, endings of nerve, lymph nodules and lymphatic vessels. Another layer, which is made up of by consistently smooth muscle cells and made up of by an inner circular layer, and a longitudinal layer of the outside the next organ found in the esophagus is the musclaris externa, in English all it’s really saying is that in literal terms it’s the outside muscle. Finally the most external and final part of the esophogas part consists of the serosa, and is a single layer of very flat serous fluid making type of cells. The visceralperitoneum. It is very well known and associated the most with a very slick and slippery corresponding parietal peritoneum, a muscle type layer lining the abdominopelvic cavity, giving way to membrane enlongativity.
There are two important, intrinsic nerve plexuses, the submucosal nerve plexus, myenteric nerve plexus, and a small subserous plexus, which is associated with the serosa. These plexus help regulate the mobility and secretory o f gastrointestinal tract organs.
Once the piece of pizza has passed the nerve plexus. The c-shaped stomach on the left side of the abdominal cavity, covered in layers and hidden behind, the liver and diaphragm. The areas near the heart are surrounded by the cardioesophageal spincter, which the pizza enters the stomach from the esophagus. Leading to the expanded lateral cardiac region called and know ass the fundus, the body is the mid-portion and inferiorly narrows. Which this part of the digestive system instinctively narrows and becomes the poric antrum. Leading to the sphincter, or also known as the value and holds about 4 liters of food when full. When not provided food this organ, the stomach collapses in on itself in a weird way. If the piece of pizza wasn’t fed to the stomach and the body had gone into starvation mode it is possible the stomachs acidic fluids could start to digest the stomachs acidic lining, and if this lining is digested for too long ulcers can occur.
The stomach acts a holding tank or a storage tank, to store digested food to the convert it and absorb the nutrients into the body. It acts as a holding unit and a unit for breaking down food both by contracting muscles and acidic breakdowns. These acidic breakdowns are caused by gastric juice, which can contain a very corrosive chemical called hydrochloric acid. Yes, in fact our body produces this very corrosive chemical that is one of the reasons why your stomach practically eats itself when not given the right amounts of nutrients in a day.
After chief cells have started to produce protein-digesting enzymes also known as pepsinogens and parietal cells, and start to break down the piece of pizza you have been digesting this whole time that piece of pizza will then be digested and pushed into the small intestine after the enzymes fro the piece of pizza have been absorbed through the stomachs mucus layers walls, the digested materials resemble that of a gross heavy cream which is titled chime.
The major digestive organ the small intestine, an organ that is actually longer than the so called large intestine. The mall intestine is a muscular tube coming from the pyloric sphincter to the ileocecal valve, Consisting of 3 subdivisions the duodenum, jejunum, and ileum, contributes five percent, almost forty percent, to almost sixty percent of the length of the small intestine. The small intestine can only process very small amounts of food at a time. Enzymes are usually produced mostly out of the pancreas than that of the small intestine. And once these enzymes are produced and absorbed into the body as energy and food for the body to function, the produce of the once object of pizza is now transported to the bile duct. This is where most food is physically broken down in a way. Basically most food absorption happens in the small intestine more than anywhere else in the body, once the food has passed and been pushed and churned its way through the small intestine it is then transferred and led to the ironically named large intestine.