What helps Frog to breathe underwater?

Frogs have a unique respiratory system that allows them to breathe both in water and on land. They primarily rely on their skin and a specialized breathing method known as cutaneous respiration when underwater.

Skin Respiration: Frogs have thin, permeable skin that allows them to absorb oxygen directly from the water through their skin. Blood vessels near the surface of their skin help transport oxygen to their cells. This is especially important when they are submerged in water, as their lungs are not as effective underwater due to the pressure of water against their chest and the difference in oxygen content between air and water.

Cutaneous Respiration: This is the process through which oxygen diffuses through the frog's moist skin into the bloodstream. The skin needs to be moist for this process to occur efficiently. Frogs often secrete mucus to keep their skin moist, and some aquatic species have specialized adaptations in their skin that enhance gas exchange.

Lung Respiration: While frogs primarily rely on cutaneous respiration underwater, they do possess lungs that are capable of some gas exchange. However, the pressure of water against their chest wall makes it harder for their lungs to inflate fully, so they aren't as efficient underwater as they are in the air.

When frogs are on land, they primarily use their lungs for respiration. They take in air through their nostrils, and the air travels to their lungs for oxygen exchange. Overall, the combination of both cutaneous and lung respiration allows frogs to survive in a variety of aquatic and terrestrial environments.