Question

How does the respiratory system change from tadpoles to adult frogs?

Answer 1

Hint: The tadpole is the larval stage of an amphibian's life cycle. Many tadpoles are fully marine, although some species of amphibians have terrestrial tadpoles. Tadpoles have attributes that would not be present in adult amphibians, like the lateral line, gills, and tails. When they encounter metamorphosis, the tadpole diet changes and the air starts to breathe.

Complete answer:
Tadpoles hatch eggs from frogs and could only live-in water. As they undergo the metamorphosis of becoming adult frogs, they adjust in several respects, shedding their swimming tails and forming the legs. Both have to take oxygen from their atmosphere, as well as the way they breathe improves as they evolve. Tadpoles use gills, whereas adult frogs include three types of respiration. Tadpoles have tiny outer gill flaps that remove oxygen from the air as it moves through them. Tadpoles open their mouths as they float in the water. The muscles move the water to the gills as the mouth shuts. They consist of thin membranous lamellae, which take oxygen in the water in which the blood flows through diffusion. About 50% of the respiration in adult frogs occurs through the skin, called skin respiration. Tadpoles have tiny outer gill flaps that suck the oxygen out of the air as it passes through them. Tadpoles are opening their mouths as they move in the water. The muscles are shifting the water to the gills while the mouth shuts. Buccopharyngeal breathing happens through the lining of the mouth. This happens only if the frog is not submerged in water. The lining of the mouth is very moist which can be used to carry oxygen to the blood by dissolving it and diffusing it into the blood capillaries in a similar way to that of the skin respiration mechanism. Pulmonary respiration is breathing from the lungs. The lungs of the frogs are relatively underdeveloped and not being used all the time. Because they have no diaphragm to help control the air capacity of the lungs, they utilize their mouths, gullets, and nostrils to force the air into or out of the lungs. Frogs use their lungs so they are involved and cannot get sufficient oxygen from their skin respiration.

Note:
Frogs often have a respiratory surface mostly on the lining of their mouth, which is quickly swapped for gas. While this phase is the predominant form of breathing at rest, it only fills the lungs periodically. That's because the lungs, which only adults have, are not very well-formed.