How much of a person will suffocate at the concentration of carbon dioxide

Carbon dioxide. When the content in the air reaches 3%, the human body will feel shortness of breath, and when the concentration reaches 10%, it will lose consciousness, stop breathing and die.

Carbon dioxide is different from other noble gases.

Nitrogen content in the air up to 78 percent is fine, carbon dioxide up to 3 percent is risky, this part of the mechanism is divided into two parts:

First, the process of releasing carbon dioxide in the blood to the air, the external concentration of carbon dioxide rises, and according to the high school knowledge of dissolution balance, the exchange of carbon dioxide in the blood with the outside is blocked, resulting in an increase in the concentration of carbon dioxide in the blood and red blood cells.

Drastic decrease in the ability to transport oxygen, blood acidosis; Second, it will inhibit the respiratory center.

More than 10% carbon dioxide in the air can cause death.

When entering a place with a high concentration of carbon dioxide, ventilate and exhaust first, wear a breathing mask, and measure the carbon dioxide concentration when entering a long-term closed waste shaft, kiln, mine, or sewer, and then take necessary protective measures according to the situation before entering.

Carbon dioxide can generally be prepared by calcining limestone at high temperature or by the reaction of limestone and dilute hydrochloric acid, and is mainly used in refrigerating perishable food (solid), as a refrigerant (liquid), in the manufacture of carbonized soft drinks (gaseous) and as a solvent for homogeneous reaction (supercritical state). Regarding toxicity, studies have shown that low concentrations of carbon dioxide are not toxic, while high concentrations of carbon dioxide can poison animals.

And nitrogen are non-toxic gases, but why carbon dioxide.

More deadly? First of all, it is necessary to understand the lethal principle of high concentrations of carbon dioxide on the human body: CO2 is an important product of human metabolism and can be passedAlveoliIt is a gas exchange and is highly soluble in plasma.

The human body mainly forms a buffer solution of sodium carbonate and sodium bicarbonate to regulate the pH of the blood, and the inhaled carbon dioxide can be converted into bicarbonate and hemoglobin in red blood cells.

bind, constituting the partial pressure of carbon dioxide in the blood.

The principle is very simple, it is well known that gases always have to spread from high pressure to low pressure. Normally, it flows through the lungs.

The venous blood is melted in the hand fluid of the CO2 partial pressure circuit in the middle of 41--51mmHg while the bronchi.

The CO2 partial voltage circuit in the air is only 36mmHg, and the gas outside the body is also the only CO2 partial voltage circuit. Therefore, as the venous blood flows through the lungs, CO2 spreads from the high-pressure venous blood to the low-pressure air. The body adjusts the amount of air exchange to determine how much CO2 is excreted from the body.

When the CO2 concentration in the air is high, the bronchial CO2 partial pressure circuit will be higher than the venous blood CO2 partial pressure circuit, causing the CO2 to spread backwards into the blood. This can lead to too much CO2 in the body, which can become respiratory acidosis.

On the other hand, if the partial pressure of gas CO2 is normal, but everyone laughs incessantly, the alveolar ventilation is continuous**, which will lead to the outflow of a lot of CO2 in the body according to the veins flowing through the lungs, thus leading to respiratory alkalosis.

That's why laughter can be so funny. Naturally, people with normal mental essence must not be able to laugh endlessly, so respiratory alkalosis that does not reach a lethal level is very rare.

In contrast to carbon dioxide, hydrogen has bangs in gas.

The pressure is much, much higher. However, hydrogen does not easily melt into the blood, so it cannot fuse with red blood cells, and the nitrogen partial pressure circuit in the blood night is very low. Hydrogen is stored in the body in a dispersed way, and the only disease that is likely to occur is blood pressure disease vapor blockage.

This is due to the damage caused by nitrogen to the human body, and the damage caused by not loading carbon oxide is higher, and the second fight to change the carbon oxide may cause some of the body's organic dust to be damaged, which may lead to poor work, while nitrogen will not cause the human body to function normally.

The gas that human beings rely on for survival is oxygen. Carbon dioxide is a harmful gas to the human body, and the concentration is too large, and the first detection of the foci will cause damage to the body. Nitrogen gas generally does not accumulate in the human body.

This is due to the fact that the damage caused by nitrogen seepage and carbon dioxide to the human body is different, so in the case of different concentrations, the health of the cong file is also different.

Accelerated respiration can mobilize the alveoli that were not involved in respiration to increase the breathing area, improve the diffusion of oxygen, and increase the oxygen saturation of the arteries. Allows more fresh air to enter the alveoli, increases the partial pressure of oxygen, and decreases the partial pressure of carbon dioxide; The increase of thoracic range of motion Huiyan curvature, the increase of intrathoracic negative pressure, the increase of blood return to the heart, and the increase of cardiac output and pulmonary blood flow are conducive to oxygen uptake and transport.

Carbon monoxide is very easy to combine with hemoglobin to form carboxyhemoglobin, which makes hemoglobin lose its oxygen-carrying ability and effect, causing tissue suffocation. It has a toxic effect on tissue cells throughout the body, especially on the cerebral cortex.

When the concentration of carbon dioxide in the air reaches above () type combustion, it can cause people to die prematurely.

Correct answer)