What Are the Steps of Food Digestion?

The process by which the digestive organs of animals or humans turn food into nutrients that can be absorbed by the body; the process in which macromolecular substances such as starch, protein and fat in food are transformed into small molecular substances that are soluble in water under the action of digestive enzymes. digestion. It also metaphors to grasp and absorb knowledge.

[xio huà]

Animal or human

Digestion is the passage of the body

The meaning of elimination, reduction, and reduction refers to the reduction of the volume of tangible objects, and is also used to describe the reduction of intangible substances, energy, and time. From the side of the water word, the original meaning of the solid snow and ice volume decreased to become liquid water. The homophonic synonyms "pin" and synonyms "shuo" describe the melting of a solid metal into a liquid.

Disappear in "

Digestive tube	Digestive gland	Digestive juice	Secretion (rising day)	Digestive enzymes	Digested substances	Digestion products
Oral cavity	Salivary glands	saliva	1.0 ~ 1.5	Salivary amylase	starch	maltose
esophagus	no	no		no	no	no
stomach	Gastric gland	Gastric juice	1.5 ~ 2.5	Pepsin Rennet (adult without)	protein	Peptide
Small intestine	liver pancreas Small intestine gland	bile pancreatic juice Intestinal fluid	0.8 ~ 1.0 1.0 ~ 1.5 1.0 ~ 3.0	no Pancreatic amylase Trypsin Chymotrypsin Pancreatic lipase Enteropeptidase Sucrase Lactase Maltase Intestinal lipase	Fat (emulsified | physical change) starch protein protein fat Peptide sucrose lactose maltose fat	Small fat particles maltose Peptide Peptide Glycerin , fatty acid Amino acid Glucose , Fructose Glucose , galactose glucose Glycerin , fatty acid
the large intestine	no	no		no	no	no

Ingredients that can be absorbed by the small intestine

Gastrointestinal smooth muscle is a muscle with low excitability and slow contraction. It is often in a slightly contracted state called

The blood supply of the various organs of the digestive system comes mainly from the branches of the abdominal aorta: the abdominal cavity arteries, the superior and inferior mesenteric arteries. The celiac artery supplies the lower esophagus, stomach, duodenum, pancreas,

During the digestive process, the activities of the various parts of the digestive system are closely linked and coordinated. If the movement of the digestive tract increases,

The activities of the digestive system are closely related to circulation, breathing, and metabolism in the body. During the digestive period, the activities of the circulatory system are strengthened accordingly, and the amount of blood flowing through the digestive organs is also increased, which is conducive to the digestion and absorption of nutrients. In contrast, circulatory dysfunction, especially portal circulatory dysfunction, will seriously affect the normal progress of digestive and absorption functions. Digestive activity is also closely related to the next process, intermediate metabolism. Eating action reflexively excites the vagus-insulin system and promotes the early release of insulin; during the digestion process, certain gastrointestinal hormones released by the stimulation of food and digestive products can also cause insulin secretion. Insulin is an important hormone that promotes energy storage in the body. The early release of insulin is conducive to timely promotion of intermediate metabolism of nutrients and effective energy storage. These are beneficial to the body's life activities. Mental anxiety, nervousness, or autonomic nervous system dysfunction can cause disorders in digestive tract movement and digestive gland secretion, which in turn can cause gastrointestinal tissue damage.

People are accustomed to eating fruits after a meal, thinking that this can help digestion and absorption of nutrients such as protein, fat, sugars in food. Not long ago, some nutritionists believed that eating fruits after a meal would lead to digestive disorders. Because food enters the stomach after 1-2 hours of digestion before it can be slowly excreted, and fruits are easily absorbed and do not need to stay in the stomach for a long time. It is a monosaccharide food. Bloating, diarrhea or constipation. Nutritionists believe that it is best to eat fruit an hour before a meal. In this way, the immune function of the human body can be kept normal.

At a banquet, fruits are sometimes used as desserts and sometimes as a clear dish after a meal. How to eat various fruits is described as follows:

Kiwis: Kiwis are peeled and sliced like tomatoes. They are often used as a material for fruit plates, or they are used to decorate salads and desserts.

Melon, papaya and pomegranate: These types of fruits are usually frozen before serving and cut into halves or quarters depending on their size. Fruits with many seeds inside, such as papaya, all seeds should be cleared before serving. Then use a spoon to dig out the flesh to eat.

Fresh pineapple: Use a sharp knife to cut off the ends of the pineapple head and tail and the rugged barbed skin, and then cut the remaining flesh into round slices. After the pineapple slices are served on the plate and served on the table, guests can eat with dessert forks and spoons.

Watermelon: Unless cut in advance, remove the watermelon seeds, and treat it as the same fruit in the fruit plate, watermelon should not be included in the menu of formal meals. Watermelons can't be used for formal dinners because the fruit has too many seeds, and guests must spit out the seeds while eating, and then put the watermelon seeds on the plate by hand. However, watermelons are very popular in outdoor informal occasions, because everyone can spit seeds freely in this occasion, not just children.

Fruit is people's favorite food. It is sweet and delicious, rich in nutrition, and has the effect of preventing and curing diseases. Fruits rich in vitamin C can strengthen the body's resistance, prevent colds, scurvy and so on. Apple and lemon contain nutrients such as malic acid and citric acid, which have a good digestive effect.

But improper consumption of fruits can also affect health. Eating too much lemon can damage mucous membranes and cause gastrointestinal disorders. Eat zongzi on an empty stomach. The tannic acid contained in zongzi is combined with stomach acid and easily coagulates into a block. Eating more rice dumplings will also affect the body's absorption of iron. The amygdalin in almonds will generate highly toxic hydrocyanic acid or benzaldehyde after hydrolysis. If eaten improperly, it will cause acute poisoning. Pineapple enzymes in pineapples can cause allergic reactions. Excessive consumption of chestnuts can cause blood sugar to drop and dizziness. People with ulcers and hyperacidity should not eat fruit with high acidity such as bayberry and plum. Therefore, when eating fruit, you must choose according to your physical fitness, and the right amount. ^[1]