AP BIOLOGY

Detailed explanation-1: -Oxygen absorbed through their skin will enter blood vessels right at the skin surface that will circulate the oxygen to the rest of the body. Sometimes more than a quarter of the oxygen they use is absorbed directly through their skin. Tadpoles and some aquatic amphibians have gills like fish that they use to breathe.

Detailed explanation-2: -The frog has three respiratory surfaces on its body that it uses to exchange gas with the surroundings: the skin, in the lungs and on the lining of the mouth.

Detailed explanation-3: -Respiratory gas exchange is conducted through the thin, gas-permeable skin and the gills. In addition to these structures, frog tadpoles use their large tail fins for respiration; the tail fins contain blood vessels and are important respiratory structures because of their large surface area.

Detailed explanation-4: -But the ability to breathe through skin, which is called cutaneous respiration, is a common trait in amphibians. The frog is a good example. Essentially, a frog’s skin is thin, and it has a lot of blood vessels. Oxygen diffuses into the skin through those blood vessels.

Detailed explanation-5: -Skin breathing, or cutaneous, gas exchange is an important route of respiration in many aquatic or semiaquatic vertebrates, and is particularly well developed in the amphibians. The skin of amphibians contains a unique vasculature that facilitates oxygen (O2) uptake and carbon dioxide (CO2) excretion.