 Dear students, in this topic, we shall discuss the Midgard, which comprises of the small intestine. Small intestine is the major site for the chemical digestion and absorption of the digested food products. In intestine digestion takes place in alkaline medium in comparison to the acidic medium present in the stomach, because food has to enter from stomach, which is acidic and alkaline medium, which is digested by my food. The small intestine is a long portion of the elemental canal. It is divided into three distinct parts. First is called the duodenum, second is the jijunum, and third part is the helium. Duodenum is the first shorter section of small intestine. In humans, it is about 25 centimeters long. Duodenum is used to receive food from stomach through pyloric sphincter, which also secretes mucus and enzymes. In addition, it receives bile salts from gallbladder and pancreatic juice from the pancreas. Gullbladder contains bile salts, which assist in the emulsification of fats, whereas pancreatic juice contains a lot of enzymes, which aid in the digestion of all major components of food. Duodenum is a longer section of small intestine. In humans, the length of jijunum is about 2.5 meters long. It secretes many enzymes for digestion. It is also involved in the absorption of some products of digestion. Elium is the longest part of small intestine, which is about 3.5 meters long in humans. It primarily absorbs nutrients, which are digested in the duodenum and jijunum part. It also secretes some enzymes to complete the process of digestion. This way, digestion is complete in the duodenum, and most of the nutrients are absorbed in the duodenum. Dear students, The length of human small intestine is about 6 meters. The lengths of small intestine vary in different animals. Overall, the carnivores of the small intestine are smaller than the herbivores and are comparatively simple, whereas herbivores of the small intestine are usually longer and more complex. The shorter lengths of the carnivores of the small intestine show that the carnivores are different, so the digestion of meat takes less time compared to the digestion of vegetation. A classic example of this difference in the length of small intestines of carnivores and herbivores is seen in frog. Frog's larvae, that is carnivorous, is comparatively long as compared to the adult frog, which is carnivore. Frog's tadpole is herbivore, and the length of the small intestine is more, and compared to that, the length of the carnivorous adult frog is less. Dear students, small intestine also contains large number of bacteria, protozoans and fungi, which contribute enzymatically to digestion. These symbiotic microorganisms in the small intestine also synthesize many essential vitamins.