The esophagus is the connecting muscular tube between the throat and the stomach. There are actually two tubes that connect to the pharynx.

One is the esophagus that goes to the stomach and the other is the trachea that goes to the lungs. If by chance the food goes into the trachea, this tube closes the epiglottis, which is a flap, to prevent the food from going forward. The food then shifts back into the esophagus through the upper esophageal sphincter. The esophagus passes the food to the stomach by a process called peristalsis, wherein the muscles above the bolus contract and push it down, and the ones below relax and allow it to pass into the stomach. When the bolus enters the stomach, the stomach churns it to very small pieces. The digestive glands present in the food break it down and mix it and the strong stomach digestive juices and the made up of pepsin and hydrochloric acid. The bolus turns into an almost-liquid form called 'chime'. When the food breaks down due to the acids and the, proteins, carbohydrates, and fats are released. Excess eating can give you heartburn; if you eat when your stomach is already full, then the stomach produces more digestive acid, which will push the excess food back into the esophagus. 

As the esophagus is located in front of the Soma Biotics heart, heartburn can occur. Small Intestine The small intestine is divided into three parts: the duodenum, jejunum, and ileum. The small intestine is a coiled tube that is located in the abdomen. If it is uncoiled, it is actually 29 feet long. The pancreas releases and the liver releases bile, which aid in breaking down the food. The bile that the liver produces is helpful for digesting fats. The breaking down process of the food takes place in the duodenum, after which it is passed to the jejunum and then to the ileum. These two components absorb all the remaining nutrients and water from the food. These absorbed nutrients are passed on to the blood vessels, and are subsequently carried throughout the body. When all the nutrients and water are absorbed from the bolus, the indigestible matter, which is soft but can take form, called stool is passed into the large intestine. The large intestine has three components. The first is the mecum, which is a pouch that houses the appendix. Second is the colon, which again has three sections: ascending, transverse, and descending. The first two components absorb the fluids and salts and produce mucus to help the stool move easily through the descending colon to the rectum, which is the final component of the large intestine, from which the stool is excreted from the body. 

The human digestive system is a delicate and complex one, and many internal organs working in harmony and one another. Taking good care of this system by watching the kind of food you eat will enable you to live a healthy life. The first part of the duodenum is more susceptible to peptic ulcers, mainly due to its exposure to the chime that contains neutralized stomach acids. The duodenum is a short tube-like structure that is considered as the first and the shortest segment of the small intestine. The other two parts of the small intestine are jejunum and ileum. But sometimes, the duodenum is also regarded as a separate structure. In humans, the duodenum is about 25 to 30 cm in length, and it connects the stomach and the jejunum. As one of the most important parts of the digestive system, it is concerned and both digestion of food and absorption of nutrients. In fact, most chemical digestion takes place in the duodenum. The duodenum is located just below the stomach, and its first part is quite close to the liver and the pancreas. It is located between the stomach and the jejunum. Anatomically, this small organ is divided into four parts or segments, which are known as the superior, descending, horizontal, and ascending duodenum. It begins and the duodenal bulb, which is located next to the stomach. The first or superior part of the duodenum is nothing but a continuation of the duodenal end of the pylorus. 

The second or the descending part is the portion, where the duodenum begins to curve or descend. This is where the common bile duct and the pancreatic duct enter the duodenum. The third part of the duodenum is the horizontal portion. The fourth or the ascending part, connects to the diaphragm by the ligament of Traits, and then leads to the jejunum. The duodenum ends at the duodenojejunal flexure, the point where it meets the jejunum. Its main function is to receive partially-digested food from the stomach, and then complete the process of digestion. Let's find out how a small organ like duodenum accomplishes this important task. In the stomach, food is mixed and stomach acids, and then digested partially. This mixture of semi-digested food and stomach acids is known as chime. The duodenum receives the acidic chime from the stomach, and then starts breaking it down and the help of an intestinal juice. There is a small circular opening between the stomach and the duodenum, known as pylorus, which releases the chime into the duodenum. The cells present in the duodenal epithelium release two hormones, known as secreting and cholecystokinin. Secreting is released in response to the presence of excess acids in the duodenum, while the secretion of cholecystokinin is stimulated by the presence of amino acids and fatty acids. The hormone secreting stimulates the gallbladder to release alkaline bile, while cholecystokinin induces the pancreas to secrete bicarbonates into the duodenum. 

The pancreas also releases several (lipase, amylase, and try sin) into the duodenum. These secretions increase the pH of acidic chime, and play a crucial role in digestion. The inner lining of the duodenum contains crypts. These crypts are responsible for increasing the surface area of the intestinal membrane, and thereby ensure better digestion. The duodenum also contains smooth muscles, which facilitate the movement of waste materials down the large intestine. The duodenum is responsible for regulating the rate of gastric emptying, and triggering the hunger signals. Gastric emptying refers to the emptying of the stomach, i.e., the process of food leaving the stomach and entering the duodenum. These functions are facilitated by the hormones secreted by the duodenal epithelium. Absorption of many essential nutrients takes place in the duodenum. It houses the Brunner's glands, which are responsible for producing a mucus-rich alkaline secretion that serves several important purposes. It protects the duodenum from the acidic chime, and lubricates the intestinal wall, besides facilitating the absorption of nutrients. The Brunner's glands are also concerned and secreting urogastrone, which prevents the secretion of acid and other digestive by the parietal and chief cells of the stomach. The duodenum is the site of iron and calcium absorption. Other nutrients that are absorbed in the duodenum are Vitamin A and B1, amino acids, fatty acids, monoglycerides, phosphorus, and mono and disaccharides. The base of the duodenum, jejunum, and ileum contains the panted cells that secrete antibacterial to protect the intestine from microbes. 

These cells help prevent the excessive growth of intestinal flora. To sum up, the duodenum is concerned and the digestion of food, absorption of nutrients, regulation of the rate of gastric emptying and hunger, and the movement of food through the intestinal tract. It has been observed that more food and nutrients are absorbed in the duodenum than the stomach. The gastric bypass surgery (used for treating morbid obesity) often involves the duodenum, due to its immense importance in the absorption of nutrients, and regulation of hunger and movement of food. The gallbladder is a small, green, pear-shaped organ located in the abdominal cavity of vertebrates. It grows to a length of 8 centimeters, and has a diameter of 4 centimeters. The function of the gallbladder is to store the bile secreted by the liver. The gallbladder is located beneath the liver. Its location corresponds to the lowest ribs, on the right side of the rib cage. The abdominal cavity, in which the gallbladder is located, is termed as the gallbladder fosse, which is nothing but a depression on the undersurface of the liver, between the quadrate and the right lobes. 

The organs that come in contact and the gallbladder are the liver, the abdominal wall, the transverse colon, and the duodenum or small intestines. The cystic artery, a branch of the right hepatic artery, supplies oxygenated blood to the gallbladder, while the deoxygenated blood is carried out by the cystic vein. The cystic vein drains the blood into the portal vein. The gallbladder is supplied by nerves of the sympathetic and parasympathetic nervous systems, which arise from the celiac plexus located in the abdomen. In addition to this, the gallbladder contracts in response to the hormone cholecystokinin secreted by the duodenum. The gallbladder has three parts, which are the funds, body, and neck. Funds The funds are the rounded part of the gallbladder that is farthest from the cystic duct, and is covered and peritoneum.