Q:

How do frogs breathe underwater?

A:

Adult frogs breathe through the skin when under water. They have thin skin, which has a massive network of blood vessels and capillaries under it. Oxygen enters the frog’s body through the skin and goes into the blood stream, which carries it to the rest of the body. Once the blood cells have released the oxygen, they absorb carbon dioxide and carry it back to the skin for excretion.

The exchange of gases through the frog’s skin, known as cutaneous respiration, occurs by diffusion. Oxygen and carbon dioxide diffuse down the concentration gradient, from an area of high concentration to an area of low concentration. Cutaneous respiration accounts for more than half of the respiration in adult frogs. It occurs both in and out of water but requires moist skin. The frog’s skin has glands that secrete mucus to keep it moist when the animal is on dry land.

Frog larvae, or tadpoles, breathe through external gills when under water. The gills, like the adult frog’s skin, absorb oxygen from the water and excrete carbon dioxide. However, as tadpoles mature into adults, their bodies absorb the gills and turn them into internal organs. They also develop lungs, which they use to supplement the oxygen absorbed by the skin.


Is this answer helpful?

Similar Questions

  • Q:

    How does a frog breathe?

    A:

    A frog breathes through its skin, the inner surface of its mouth and its lungs, depending on its circumstances. When their skin is moist, and particularly when they are in water where it is their only form of gas exchange, they breathe through their skin. When it is necessary, such as on land, they take air into their lungs by pushing it from their mouths with their nostrils closed.

    Full Answer >
    Filed Under:
  • Q:

    What are hallucinogenic frogs?

    A:

    Some frogs and toads secrete substances from glands in their skin that can have hallucinogenic effects when ingested or dried and smoked. The best known such species is Bufo alvarins, the Colorado River toad.

    Full Answer >
    Filed Under:
  • Q:

    Why do frogs lay their eggs in water?

    A:

    Although amphibious frogs live on land and in water, they must lay their eggs in water or the eggs will dry up, effectively killing the offspring inside. Frog eggs are covered with a glycoprotein, which helps keep the eggs moist. This glycoprotein has to keep in contact with a source of moisture, such as water.

    Full Answer >
    Filed Under:
  • Q:

    How do frogs typically behave?

    A:

    Frogs typically eat insects and make frequent vocalizations. These behaviors are common to all frogs but vary according to species, seasons and the local environment.

    Full Answer >
    Filed Under:

Explore