The product of body surface metabolism is dander. The skin and pores on the body surface will breathe, and at the same time, a variety of secretions, such as oil and sweat, will be discharged. At the same time, people live in the air, and it is normal for bare skin to be contaminated with air dust. This is called bath mud. Very nutritious. What turtle son wiped off is called diatom mud.
However, the reason why the strips can be rubbed out is because the main component in the mud strips is the keratinization of flat cells in the human body, which has great friction resistance and prevents foreign bodies from invading the body.
This is dust or ash attached to your skin when you go out to play or fight every day. Taking a bath repeatedly every day, rubbing hard will still "mud". After all, human metabolism will never stop, and the product of metabolism on the body surface is dander. The skin and pores on the body surface will breathe, and at the same time, a variety of secretions, such as oil and sweat, will be discharged. She never washes her face. One night, a thief went to her house to steal something, and she found out. She shouted, which thief cut her back and lost a piece of skin that thick on her face, which scared her. She touched it with her hand and didn't blow it on the meat. In my hometown, I remember that Sichuanese called the mud they rubbed off in the shower "Zunzun". Wipe the bottle on your ditch! When I was a child, I often heard adults shout like this in Sichuan dialect. What do you mean? Is to wipe the dust off your ass
In this way, naturally those aged skin will "die" and they will gather on the surface and pores of the skin. When you rub them in the shower, it will be black dirt, which is what you call "mud". The main components of this mud are dander, grease, dust and sweat. The first thing to know is that the human body is constantly metabolized, and the product of metabolism on the body surface is dander. The same skin and pores breathe.