Question

In a frog, cutaneous respiration takes place

• A. Always
• B. Only on land
• C. Only in water with pulmonary respiration
• D. Only in water, pulmonary respiration does not occur

Answer 1

The correct option is A Always

In a frog, the exchange of gases with the surrounding atmosphere for respiration, takes place through the skin, in the lungs and on the lining of the mouth. The skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels. The thin membranous skin allows the respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings. When the frog is out of the water, mucus glands in the skin keep the frog moist, which helps absorb dissolved oxygen from the air. Even when the frog is completely submerged, all of the frog's respiration takes place through the skin. So, cutaneous respiration of the frog is a constant method of respiration.
So, the correct answer is option A.