What organs do humans rely on to absorb nutrients?

The digestive organs of the human body mainly include the mouth, esophagus, liver, stomach, small intestine, large intestine, etc. The oral cavity is at the head of the human body. The mouth contains teeth and tongue, as well as salivary gland openings that secrete saliva. The esophagus is located in the chest and is the passage from the mouth to the stomach. The stomach is located on the left side of the upper part of the human abdominal cavity. It is shaped like a large leather bag. The muscles of the stomach are very developed and it keeps moving when there is food. The liver is on the right side of the upper part of the human abdomen. The green thing attached to the liver is called the gallbladder. The gallbladder contains bile. When the liver secretes bile, it reaches the small intestine through the bile duct. The small intestine is in the lower part of the human abdominal cavity. It is connected to the stomach above and the large intestine below. It is thin and long, about 5 to 6 meters long, and is twisted and folded together. The thicker ring around the small intestine is the large intestine. The upper end of the large intestine is connected to the small intestine, and the lower end is the anus, which is the outlet for feces. \x0d\\x0d\The whole process of digestion and absorption: \x0d\\x0d\Digestion in the mouth and the role of saliva: Saliva is a digestive juice. Saliva can help digest the water-insoluble starch in food, turning it into water-soluble sugar, which can then be further digested by other digestive organs and absorbed by the body. \x0d\\x0d\Stomach digestion and the function of gastric juice: After food is initially digested in the mouth through chewing by teeth and the action of saliva, it reaches the stomach through the esophagus. The stomach has the function of storing and further digesting food. The stomach can secrete a digestive juice called gastric juice. Gastric juices digest protein in food. When the stomach digests food, it keeps contracting and peristalsis, so that the food and gastric juice are fully mixed to form porridge-like chyme. The initially digested chyme enters the small intestine in batches. \x0d\\x0d\Digestion of the small intestine and the functions of intestinal juice, bile, and pancreatic juice: The small intestine has the function of further digesting and absorbing nutrients. It also has a digestive juice called intestinal juice. Intestinal juice, together with bile secreted from the liver and pancreatic juice secreted from the pancreas, can completely digest food. Nutrients are absorbed in the small intestine. \x0d\\x0d\The function of the large intestine: As most of the nutrients in the chyme are absorbed, the chyme reaches the end under the peristalsis of the small intestine, leaving only some residue, and then enters the large intestine. The large intestine further absorbs the water in the food residue, thickening it to form feces, which is expelled from the body through the anus. \x0d\\x0d\This is the main organ and process of human body digesting food and absorbing nutrients.