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Anonymous users2024-02-08Gastric juice is a general term for gastric secretions. These include water, electrolytes, lipids, proteins, and peptide hormones. Pure gastric juice is a colorless transparent liquid, with a specific gravity of liters, a daily secretion of liters, containing about solids, and inorganic substances are mainly Na+, K+, H+ and Cl-.
The ion concentration varies with the secretion rate of gastric juice, when the secretion rate increases, the concentration of Na+ decreases, and the H+ increases rapidly, up to 150 mgeq liters, Cl- also increases slightly, while K+ is basically stable. H+ and Cl- combine to form hydrochloric acid. Organics include pepsinogen, mucoprotein, and "intrinsic factor".
These components are secreted by various epithelial cells in the gastric mucosal layer, with parietal cells secreting HCl and intrinsic factors, and master cells secreting pepsinogen. Mucus is secreted by epithelial cells on the surface of the gastric mucosa and a small number of cervical mucus cells scattered in the fundic glands and neck, and gastrin is secreted by "G" cells. Hydrochloric acid in gastric juice activates pepsinogen to become active pepsin and creates an acidic environment for pepsin hydrolyzed proteins.
HCl also has a bactericidal effect. Pepsin activates pepsinogen. In addition to lubricating food, mucus proteins protect the epithelial cells on the surface of the gastric mucosa from HCl erosion, and the "intrinsic factor" is a glycoprotein that is required for the absorption of vitamin B12 in the small intestine.
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Anonymous users2024-02-07If electrolytes, lipids, proteins, and peptide hormones are not considered, hydrochloric acid with pH2 can be used instead.
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Anonymous users2024-02-06Gastric juice is acidic and used to digest food, which can be replaced with hydrochloric acid, of course, gastric juice contains a variety of enzymes, but enzymes are difficult to replace with chemical agents.
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Anonymous users2024-02-05The gastric juice is mainly hydrochloric acid, and enzymes are done by themselves.
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Anonymous users2024-02-04Drinking water will dilute hydrochloric acid, so the mass fraction will rise, but due to the stability of the human internal environment, after a period of time, it will still drop to the original value and remain relatively stable.
If not, you think, as soon as you drink water, the hydrochloric acid content in the gastric juice decreases without end, then isn't the hydrochloric acid in the gastric juice infinitely diluted and gradually disappears? The answer is also D.
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Anonymous users2024-02-03The answer is that first drinking water is to increase the solvent, and it is the solute mass fraction that decreases.
After that, the body automatically maintains balance, and the water flows to the intestines and is absorbed by the body.
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Anonymous users2024-02-02d first diluted, and then with the absorption of water, the concentration increases.
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Anonymous users2024-02-01Yes option B After drinking water, the hydrochloric acid is diluted, and the quality is reduced.
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Anonymous users2024-01-31b is correct because the hydrochloric acid in the stomach will be diluted after drinking water.
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Anonymous users2024-01-30Gastric juice is mainly composed of pepsin and hydrochloric acid. Pepsin is a protein that is a harmless digestive enzyme. However, hydrochloric acid is very corrosive and can easily destroy the tissue cells of the stomach.
Therefore, it is not enough to rely on the regenerative capacity of the stomach and the protective effect of the gastric mucosa. The epithelial cells of the stomach wall are also covered with a thin layer of carbohydrates, the so-called glycosome layer. It can further strengthen the protection of the stomach.
In addition, the lining of the stomach is covered with a layer of fatty substances called lipids. Such substances have a strong inhibitory effect on hydrogen and chloride ions of hydrochloric acid
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Anonymous users2024-01-29Gastric acid (hydrochloric acid), pepsin, mucus. A small amount of gastrin.
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Anonymous users2024-01-28It's not that it doesn't work, it's just too wasteful. The purity of the analytical purity is quite high.
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Anonymous users2024-01-27Practice one more question:
A h is a common substance in junior high school chemistry. Please combine the transformation relationship between them in Figure 1, the following question (" in the figure "" indicates that there is a transformation relationship between substances).
1) A is the least dense gas under standard conditions, and the chemical formula of A is that A, B, and C contain the same element, and the solution of C B is yellow, so it is inferred that the substance that reacts with C to form B is
2) d is a gas element, write the chemical equation of b d 3) the industry commonly used g f reaction ironmaking, the chemical equation of the reaction is 4) E H PRODUCES WHITE PRECIPITATE, AND DILUTE HYDROCHLORIC ACID IS ADDED DROPWISE TO THE FILTRATE AFTER FILTRATION, AND THE RELATIONSHIP BETWEEN THE VOLUME OF GAS PRODUCED AND THE VOLUME OF DILUTE HYDROCHLORIC ACID ADDED IS SHOWN IN FIGURE 2 ON THE RIGHT.
The solutes in the filtrate are:
Write the chemical equation for e h
The chemical equation for f e
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Anonymous users2024-01-26There is no diagram...
The lightest gases should be: hydrogen;
One use of substance B is to extinguish fires, and B should be: carbon dioxide.
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Anonymous users2024-01-25(1) Write the chemical formula of f and mark the valency of each element.
1h2-2o
2) The reaction between c and d requires high temperature conditions, write the chemical equation for the reaction where they occur:
3CO+Fe2O3 high temperatureThe chemical equation for the reaction of 2Fe+3CO2(3)a and E is.
2HCl+Ca(OH)2=CaCl2+2H2O, the type of reaction belongs.
Metathesis reaction
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Anonymous users2024-01-24No picture. Your answer should be correct, though.
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