Why does frog have both cutaneous and pulmonary respiration?
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Respiration in Tadpoles
Tadpoles have tiny external gill flaps that extract oxygen from water as it passes over them. Tadpoles open their mouths as they swim and take in water. As the mouth closes, muscles transfer the water to the gills. These consist of thin membranes called lamellae, which take oxygen from the water where it enters the blood stream through the process of diffusion. Tadpoles can also rise to the surface and gulp oxygen from the air. As tadpoles mature the gills are absorbed by the body as other respiratory systems develop.
Cutaneous Respiration in Frogs
Over 50 percent of the respiration in adult frogs takes place through the skin, the journal "Biological Reviews of the Cambridge Philosophical Society" reports. This is called cutaneous respiration. Most carbon dioxide is exhaled through the skin and most oxygen is absorbed through the skin, except during the breeding season when the lungs absorb more oxygen. The skin is thin and has blood vessels and capillaries close to the surface. Frogs always have moist skin due to glands which produce mucus across the skin, and this moisture allows the oxygen in the air to be absorbed into the skin and transmitted into the blood stream. During hibernation and aestivation this is the only form of respiration they use.
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Tadpoles have tiny external gill flaps that extract oxygen from water as it passes over them. Tadpoles open their mouths as they swim and take in water. As the mouth closes, muscles transfer the water to the gills. These consist of thin membranes called lamellae, which take oxygen from the water where it enters the blood stream through the process of diffusion. Tadpoles can also rise to the surface and gulp oxygen from the air. As tadpoles mature the gills are absorbed by the body as other respiratory systems develop.
Cutaneous Respiration in Frogs
Over 50 percent of the respiration in adult frogs takes place through the skin, the journal "Biological Reviews of the Cambridge Philosophical Society" reports. This is called cutaneous respiration. Most carbon dioxide is exhaled through the skin and most oxygen is absorbed through the skin, except during the breeding season when the lungs absorb more oxygen. The skin is thin and has blood vessels and capillaries close to the surface. Frogs always have moist skin due to glands which produce mucus across the skin, and this moisture allows the oxygen in the air to be absorbed into the skin and transmitted into the blood stream. During hibernation and aestivation this is the only form of respiration they use.
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The frog has "3 respiratory surfaces" on its body which it is using to swap the gas with surroundings: The skin, which in the lungs and on the mouth lining.
Explanation:
- When the frog is out of the water, mucus glands in the skin holds the frog moist, which assist absorb dissolved oxygen from the air.
- When the skin is entirely dries, the cutaneous respiration is not possible. Consequently, the frog dies due to asphyxia.
- Secretion of mucus by mucous gland always keeps its surface moist.
To know more:
What is pulmonary respiration?
https://brainly.in/question/1102468
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