The internal nostril openings (nares) carry air from the nostrils to the mouth, so that a frog can breathe air when on the surface, by expanding its mouth to pull in and "swallow" air. Underwater, the internal nares close to keep water out.
For the most part, frogs breathe air through the mouth, and utilize internal nares when doing so outside of the water. In the water, they can put just enough of the external nares above water, but this is more important to get rid of carbon dioxide, as frogs can diffuse oxygen from the water through their skin.
Because they need to be able to sense when a predator is approaching.
The frogs' nostrils are called external, as they are visible on the outside of the frog's snout. These nostrils allow the frog to breathe air when it is on land.
nostrils
nares are nostrils. the maxillary bones form the lateral margins of external nares/nostrils
Nares are the openings of the nasal cavity, commonly called nostrils. We have two sets of openings called anterior and posterior nares that move air through the nasal cavity into the pharynx and lungs.
External Nares
nares is what they are called for baby and adult frogs
External nares ( Nostrils) are the openings formed by the external nose that open into the nasal cavity.
external nares
Air moves in and out of the external nares, also known as the nostrils. During inhalation, air enters the respiratory system through the external nares, where it is filtered, humidified, and warmed before reaching the lungs. During exhalation, air exits the respiratory system through the same external nares.
To breath when the rest of them is underwater