The human digestive system comprises the alimentary canal—also termed the GI tract or gastrointestinal tract or digestive tract—and the hepar (liver), mixed gland (pancreas), and cholecyst (gallbladder). From the mouth to the rectum, the GI tract is made up of a succession of hollow organs connected by a long, twisting tube. The oral cavity, food pipe or gullet or oesophagus, stomach, small intestine, large intestine, and rectum are the hollow body parts that constitute the GI tract. The liver, pancreas, and gallbladder are the three most important organs in the digestive system. In order to perform its function of converting your food into the nutrients and energy you require to exist, your digestive system has been specially designed. Stool or excreta is conveniently packaged for disposal with the help of this system when it has completed its task. Nutritional breakdown occurs in the digestive tract. This allows the body to utilise them for energy, development, and repair.
Because your body needs nutrients from the food you eat and the liquids you drink to stay healthy and function properly, proper digestion is essential. Carbohydrates, proteins, lipids, vitamins, minerals, and water are all examples of nutrients. The human digestive system must first break down and absorb nutrients from the food and liquids you consume before your body can use them for vital functions including energy, development, and cell repair. Amino acids are created as a result of the breakdown of proteins. During the breakdown of fats, fatty acids and glycerol are produced. When carbs are digested, simple sugars are generated as a by-product. The passage of food and fluids through your GI tract, as well as the breaking down of food and drink into smaller bits, is aided by each component of your digestive system. After meals are broken down into tiny enough bits, your body can absorb and distribute nutrients to where they are needed. The large intestine absorbs water, whereas the waste products of digestion result in faeces. The digestive system is aided by nerves and hormones.