Question

The organs which do not participate in buccal respiration of frog are

• A. Lungs
• B. Internal nerves
• C. External nerves
• D. Mucous lining

Answer 1

Answer: (A)

Lungs

In buccal respiration, the mouth remains closed while nostrils are open. The floor of buccal cavity is alternately raised and lowered so that no air is drawn into or expelled out of buccal cavity. During buccal respiration glottis remain closed so that no air enters or leave lungs. The mucous layer of buccal cavity is richly supplied with blood capillaries, which absorb the oxygen of the air and releases carbon-dioxide.

Hence the correct option is A.