What will happen to us if the earth is deprived of oxygen for five seconds? Can you hold your breath for five seconds?

If the oxygen disappears for five seconds, it doesn't seem to matter if we hold our breath for five seconds. As some of the previous answers said, the problem of air pressure should be considered first. If I suddenly disappear about 20% of the oxygen that makes up the air, it will have a great impact on most creatures on land, which may lead to another direction of biological evolution and the emergence of the next batch of terrestrial marine creatures. After all, the pressure on land is still much lower than that of water, so the change of water pressure will be relatively small, and the impact on living things will be relatively small.

The question is, does this disappearance require the disappearance of all oxygen molecules, even oxygen dissolved in water, blood and cell fluids? If so, it's no use holding your breath. Five seconds is neither too long nor too short for people. Some people may faint, but there is no doubt that everyone will feel bad. First of all, when the air in the lungs suddenly disappears, we will feel chest tightness and general weakness. Because cell respiration is mainly anaerobic at this time, the body will feel sore.

The question is whether oxygen will come back and suddenly return to its original place, or whether it needs to diffuse naturally. For the former, it may seem like an intense exercise, and it doesn't have much influence. If it is the latter, then a person who has been in a state of shock and lost his spontaneous breathing instinct may never wake up without help! If it is the former, then he may be sent to the hospital. Please forgive me for my thoughtlessness at three points. After all, this is just a subject, which is impossible to achieve. We deserve to be a joke! "。

When I saw the first answer, it was all about what might happen after the oxygen disappeared. I think it's ridiculous. I couldn't see the meaning of the question clearly, so I wrote my own opinion. Without oxygen, we will lose about 2 1% air pressure in an instant, which is similar to jumping into the sea floor nearly 2000 meters deep. This will cause the tympanic membrane to be unable to adapt to the pressure, which will lead to nipple trauma (tympanic membrane injury caused by the unequal pressure in the ear and the environmental pressure). Air pressure injuries are usually caused by sudden changes in air pressure. For example, deep-sea diving or air travel can cause tympanic membrane swelling and severe pain. If there is no oxygen, we will all be hurt by air pressure, and it will be very serious-the eardrum may explode. So your hearing will be severely impaired.