AP BIOLOGY

Detailed explanation-1: -The lungs get filled with air giving a frog a better buoyancy, making it float more easily. The amphibians breathe through the skin because when they are under the water then they will be able to absorb the oxygen only through the skin or else due to less oxygen they will drown in the water.

Detailed explanation-2: -Most amphibians breathe through lungs and their skin. Their skin has to stay wet in order for them to absorb oxygen so they secrete mucous to keep their skin moist (If they get too dry, they cannot breathe and will die).

Detailed explanation-3: -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.

Detailed explanation-4: -The skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels. The thin membranous skin is allows the respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings.

Detailed explanation-5: -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.