Unlike humans, frogs and other amphibians without lung breathing; Their unique skin structure allows them to receive oxygen and moisture from the environment. Livescience.com information portal I found itHow frogs manage to breathe skin.
Frog leather – complicated matter. It is thin and covered by glands that produce mucus to maintain skin moisture. In addition, it is porous enough for oxygen molecules to penetrate through it. In other words, it is created so that the animal can receive air and moisture through the skin.
The network of small blood vessels directly under the skin absorbs oxygen from the surrounding air and water, and also allows the body to expose carbon dioxide in the process that scientists call skin breathing. Although frogs can also breathe through the mild and soft tissue of the mouth, breathing allows them to survive underwater and withstand hibernation time. For this, animals do not even need to apply a conscious effort: gas and water exchange their wet skin, whether they want it or not.
Moreover, not all frogs depend on the skin. The tadpoles do not have, so they need to come after the air to survive. But they are too small to break the surface tension of the water, so they create their own air bubbles.
Frog's porous skin also helps them drink. The water penetrates into the pores, then it is absorbed by the cell membrane, enters the cells and enters the blood. Many frogs even have a special piece of leather, special plans to absorb large amounts of water.
Some frogs in arid areas know how to absorb water in the rainy period. They accumulate moisture, dig into their holes, then they cover themselves with an additional layer of mucus – and they have enough accumulated liquid to extend to the next sediment. Sometimes months, sometimes the whole year.
Although porous skin is quite convenient, its permeability also means frogs and other amphibian animals are extremely vulnerable to environmental pollution and climate change. Studies have shown that frog skin permeability for animals is in danger due to commercial chemicals and micro -seeds. And due to the fact that they need to maintain wet skin, the severity of drought and heat threaten the destruction of the frog's habitat, especially in Amazon's rain forests in Brazil, Argentina and Paraguay.