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Question
When the frog is floating in water: it respires by .................. respiration.
When the frog is floating in water: it respires by .................. respiration.
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Solution
The correct option is D Both A and C
Gas exchange through skin is normal and important for amphibians which have moist and well vascularised skin. Frogs also have a respiratory surface on the lining of their mouth on which gas exchange takes place readily. While at rest, this process is their predominate form of breathing, and frog only fills the lungs occasionally. This is because the lungs, which only adults have, are poorly developed. In frogs the relative roles of skin and lungs change through the year. When oxygen uptake is low the skin takes up more oxygen than lungs. When oxygen consumption is high the uptake through lungs increases several folds. In vertebrates filling of lungs can take place with the use of pressure pump as in amphibians or a suction pump as in most reptiles, birds and mammals. A frog fills its lungs by taking air into its mouth cavity, closing its mouth and nostrils and pressing air into its lungs by elevating the floor of its mouth. As a result of this filling mechanism, a frog can continue to take in repeated volumes of air several times in sequence without letting air out. If a frog is swimming in water it cannot move the floor of its mouth to push air into lungs. Hence, during swimming frog will breathe through skin or buccopharyngeal cavity only.
Gas exchange through skin is normal and important for amphibians which have moist and well vascularised skin. Frogs also have a respiratory surface on the lining of their mouth on which gas exchange takes place readily. While at rest, this process is their predominate form of breathing, and frog only fills the lungs occasionally. This is because the lungs, which only adults have, are poorly developed. In frogs the relative roles of skin and lungs change through the year. When oxygen uptake is low the skin takes up more oxygen than lungs. When oxygen consumption is high the uptake through lungs increases several folds. In vertebrates filling of lungs can take place with the use of pressure pump as in amphibians or a suction pump as in most reptiles, birds and mammals. A frog fills its lungs by taking air into its mouth cavity, closing its mouth and nostrils and pressing air into its lungs by elevating the floor of its mouth. As a result of this filling mechanism, a frog can continue to take in repeated volumes of air several times in sequence without letting air out. If a frog is swimming in water it cannot move the floor of its mouth to push air into lungs. Hence, during swimming frog will breathe through skin or buccopharyngeal cavity only.
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