I am breathing with my mind on the ground and walking around, I am also breathing with my mind in the water. Aha! What fun. Do you remember such a fantasy?
Well, why can't we breathe in the water? Despite the fact that there is oxygen under the water, people cannot breathe in the water, and even though the fish survive by taking oxygen, the fish is still breathing in the water, isn't it?
We breathe through the lungs. Our lungs have evolved to receive oxygen in a gaseous form. See, the only difference between air and water is density. When heat is removed from the air it becomes liquid! There is oxygen in the air, there is water in the air, there is carbon dioxide in the air, there is water. Air pollution is due to the difference in the concentration of different elements in the water!
So why can't people breathe in water when there are so many similarities?
Before answering this question, let's try to find out how fish live in water. Fish also need oxygen to survive. Humans take in air through their mouths and noses, carry it to their lungs, and carry oxygen, leaving the rest in the same direction. Fish take water but do not take water inside the stomach. The reddish part beneath his elbow acts similar to that of a human lung. The water is taken out of the mouth by the concoction and the gills are collected by the oxygen.
Now the reasons why people can't breathe in water-
1. For human respiration, there are lungs that cannot absorb as much oxygenated water as fish.
2. We could only breathe if there was only oxygen in the water. But the oxygen in the water is compounded with hydrogen. In order to receive this oxygen from water, we need to break down this compound, remove hydrogen, and then take in oxygen, for which we do not have the necessary mechanisms. It also loses a lot of energy.
3. People breathe water but cannot get it out in time. Because more pressure is needed to get the water out, which the human respiratory system cannot give. The human respiratory system is a contraction of the muscles called the diaphragm and ribs, which expand the diameter of the thoracic cavity. Then the air pressure in the thoracic cavity is less than the air pressure in the external environment so air enters easily. Now imagine what would happen if there was water without air! If the water pressure in a pond or river is normally higher than the air pressure, then the pressure in the thoracic cavity will be less than the pressure in the environment.
4. Another major reason for not being able to breathe underwater is stress. Stress is an important factor. The human body can tolerate stress to a certain extent. If it is more than this, blood starts to come out from the human body to equalize the pressure of the human body. And if the pressure is more, the person can be killed. This is the reason why people cannot breathe when they go under water and if they stay for a long time, they die.
5. Basically the oxygen that fish breathe is not the oxygen of H₂O. Instead of H₂O oxygen, fish breathe O₂ (oxygen gas) which dissolves in water. Humans cannot receive oxygen from water in this way. The human lung is structurally capable of absorbing oxygen only through the air.
However, other fluids, such as fluorocarbons, have been used to test human respiration. Fluorocarbons can dissolve enough oxygen.
Maybe in the future, scientists will be able to carry out various studies in the human body, succeeding in breathing water without oxygen cylinders through new methods.
In this advancement of science, it would not be wrong for us to expect something like this. Everything else is in the hands of the superior, including not being successful.
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