How is the small intestine digested and how is food digested in the small intestine?

How is the small intestine digested?

Most of the absorption process in the body is done at the front end of the small intestine. Food is digested by the spleen and stomach, through the pylorus into the small intestine, under the microscope, there are many villous protrusions on the surface of the small intestine, these microvillous protrusions make the small intestine contact with food area more expanded, the lymphatic vessels and capillaries in the villous protrusions can be fully in contact with the digested nutrients, absorb nutrients.

Due to the peristalsis of the stomach and intestines, these "chymes" from the stomach are constantly in contact with the microvilli, so that the nutrients are continuously absorbed into the lymphatic vessels and capillaries, thus entering the lymphatic system and blood circulation system of the whole human body. At the end of the digestion process, the remaining nutrients flow through the colon, which is responsible for compressing chyme, absorbing water, and receiving B vitamins produced by healthy intestinal bacteria.

Finally, it should be noted that there are a large number of tiny particles in the intestine that are much smaller than somatic cells, which are called "intraluminal cells". Don't look at these little guys as "small", the embankment of thousands of miles collapses in the anthill, and it is essential to prevent the slightest. These tiny particles include both "good bacteria" and "bad bacteria".

Harmful bacteria will not only steal nutrients, forage for food that stays in the intestines for too long, and make harmful toxins, but also puncture holes in the intestines, damage your intestinal wall, and finally damage your joints, **, organs and endocrine glands, leading to flatulence, intestinal pain and even cancer and other diseases.

In the large intestine, some of the water is absorbed by the intestinal mucosa, and the rest of the residue is excreted under the fermentation and putrefaction of intestinal bacteria.

Tonic contraction is the basis of other forms of movement in the small intestine, and when the small intestine tone is reduced, the intestinal wall puts less pressure on the contents of the small intestine, the chyme is not sufficiently mixed with the digestive juices, and the advance of the chyme is slow. On the contrary, when the tension of the small intestine increases, the chyme and digestive juices are fully mixed and accelerated, and the chyme advances quickly. 2.

Segmented Exercise Segmental exercise is a rhythmic contraction and relaxation exercise dominated by the circumferential muscle, which occurs primarily on a section of the intestine where the chyme is located. After eating, the circumferential muscles in several parts of the intestinal tube where chyme is present contract at the same time, dividing the chyme in the intestinal tract into segments. Subsequently, the original contraction is relaxed, and the original relaxation is contracted, so that the original chyme of each segment is divided into two halves, and the two halves of the citrus adjacent to each other are closed to form a number of new segments, and so on (Fig. 8-7).

The significance of the segmented exercise is to make the chyme and digestive juices fully mixed, and increase the contact between the chyme and the intestinal wall, so as to create favorable conditions for digestion and absorption. In addition, segmented movements can squeeze the intestinal wall, which helps to return blood and lymph. Small intestine.

3.Peristaltic motility The peristalsis of the small intestine is often superimposed on the rhythmic segmental movements, and the two often coexist. The significance of peristalsis is to push the chyme after segmental movement forward, reach a new intestinal segment, and then start segmental movement.

The peristalsis of the small intestine is very slow, about 1 2 cm s, and each peristaltic wave only pushes the chyme for a short distance (about a few cm) before disappearing. In addition, there is a kind of peristaltic movement in the small intestine that spreads quickly and over a long distance, called peristaltic impulse. It pushes chyme from the beginning of the small intestine to the end of the small intestine.

Sometimes it can reach the large intestine at a rate of 2 to 25 cms. Counterperistalsis in the direction of peristalsis is often seen at the end of the duodenum and ileum. Chyme can move back and forth in these two segments, which is conducive to the full digestion and absorption of chyme.

Absorb most of the nutrients in food.

Digestion, most of it is digested by the small intestine.

Do you know the location of the small intestine meridian? Tinnitus, frozen shoulder, and cold hands and feet are all related to the blockage of the small intestine.

Question 1: What does the large intestine digest The large intestine, which is divided into the cecum, appendix, colon, rectum and anal canal [1], is an organ that absorbs water from food residues, and the food residues themselves form feces and are excreted to a certain extent.

Problem 2: The large intestine basically has no digestive function The digestive tract includes: oral cavity, pharynx, esophagus, stomach, small intestine, large intestine and **pharynx, esophagus have neither digestive function nor absorption function, and the oral cavity only has digestive function but no absorption function; The stomach absorbs water, inorganic salts, and alcohol; The small intestine is the main place of digestion and absorption, and the large intestine only has absorption function but no digestive function, and can absorb a small amount of water, inorganic salts and vitamins So the large intestine is not basically no digestive function but no digestive function So the answer is:

Question 3: Does the large intestine belong to the digestive system? The digestive system consists of two parts: the digestive tract and the digestive glands.

The digestive tract is a long muscular duct that starts from the oral cavity and continues to the pharynx, esophagus, stomach, small intestine, large intestine, and finally **, including the oral cavity, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, ileum) and large intestine (cecum, colon, and rectum).

So yes Question 4: The difference between the small intestine and the large intestine The focus is on what is the difference between digestion and absorption The small intestine is digestion and absorption The large intestine is the excretion of waste.

Question 5: What are the functions of teeth, tongue, stomach, small intestine and large intestine in the digestive system? 1.teeth, grinding food, cutting large pieces of food into small pieces, aiding digestion.

2.The tongue, stirring the food so that it is well mixed with saliva for swallowing, while the starch is initially digested under the action of salivary amylase.

3.The stomach secretes pepsin and gastric acid, and through the peristalsis of the muscular layer, it stirs and grinds food well to digest proteins.

4.The small intestine is the main nutrient absorption organ of the human body, where most of the food ingested by the human body is absorbed.

5.The large intestine receives food debris from the small intestine and absorbs water and inorganic salts to form feces. In addition, bacteria in the large intestine can also synthesize vitamin K for the body to absorb.