Why human can`t breathe through their lungs like frogs?
Humans breathe exclusively through their lungs but frogs use their lungs for only part of their respiration. Frog lungs have thinner walls and are like balloons. They often fill their lungs to help them stay buoyant when swimming. Both species have bronchial tubes leading to lungs but human systems are more complicated, with many branching bronchiole. Lungs of frogs and humans have alveoli, tiny vessels which make actual gas exchange. But, alveoli in humans are more densely packed because we breathe only through our lungs.
Frogs and humans need to breathe for same reason: to bring oxygen into the body and to expel carbon dioxide. Both have lungs for these tasks but that’s where most of the similarities end. Frogs live in a different environment than humans and differences in their respiratory systems reflect that.
Lungs:
Humans breathe exclusively through their lungs but frogs use their lungs for only part of their respiration. Frog lungs have thinner walls and are almost like balloons. They often fill their lungs to help them stay buoyant when swimming. Both species have bronchial tubes leading to lungs but human systems are more complicated, with many branching bronchiole. Lungs of frogs and humans have alveoli, tiny vessels which make actual gas exchange. But, alveoli in humans are more densely packed because we breathe only through our lungs.
Diaphragm:
As humans, we use our diaphragm to push up on our lungs and help us breathe out. Contacting the diaphragm (which sits under the lungs and separates our thoracic cavity from abdominal cavity), pushes air out. Releasing diaphragm lets lungs stretch back out, making room for air you are breathing in. frogs don’t have a diaphragm. Instead, they use muscles in their throat sacs to help draw in air and push it back into the lungs.
Skin:
Frogs have another organ they use to breathe: their skin. Frogs can exchange oxygen for carbon dioxide through their skin but it needs to be moist for process to work correctly. That’s why one typically sees frogs near water or burrowed in damp soil. Frogs’ skin is an efficient breathing machine, exchanging CO2 21/2 times faster than their lungs can. In comparison, humans eliminate less than 1% of necessary CO2 through the skin.
Mouth:
If one has never seen a frog yawn, it’s because they don’t. They don’t breathe through their mouths, only through their noses. We, on other hand, have a choice of breathing through our noses or our mouth or both. Frogs use muscles beneath their jaws to help move air but their mouths stay closed while they breathe.