1. What does frog breathe Frogs are amphibians, and their respiratory organs used in larval and adult periods are different. When tadpoles have not developed into frogs, they breathe with gills. They can breathe freely in water, and generally they will not leave the water, otherwise they will not be able to breathe. When tadpoles develop metamorphosis, they will become frogs, and then their respiratory organs become lungs, instead of continuing to breathe through gills. When frogs inhale, the lower part of their mouths is lowered, so that more air can be held in their mouths. At this time, the frogs' mouths are closed and filled with air. Frogs also have a trachea in their bodies, through which the air inhaled from their mouths will eventually reach their lungs, supplying oxygen and allowing frogs to carry out various normal life activities.
Although frogs, like humans and many other mammals, use their lungs to breathe, their lungs are not as advanced as those of humans and other mammals, so their functions are not particularly perfect and they cannot provide enough oxygen for their normal activities. Therefore, frogs do not only use their lungs to breathe, but also use their skin to assist their breathing, so that frogs can normally complete various life activities.
2. Can frogs breathe with skin As mentioned above, the main respiratory organ of frogs is the lungs, but they can't breathe only with the lungs, and they need the auxiliary function of skin. Some mucus will be secreted from the skin surface of frogs, and their skin will become moist, which will play the role of assisting breathing. Together, skin and lungs can provide enough oxygen for frogs and expel carbon dioxide in time. When it rains, the air is moist and the frog's skin is moist. At this time, the frog will be more active because of sufficient oxygen.
