BULLFROG (RANA CATESBEIANA) VENTILATION - HOW DOES FROG BREATHE

Two short-term cyclic events, buccal oscillations and ventilatory cycles, occur in the bullfrog's respiration. During ventilation the frog fills the buccal cavity with air, then blows the pulmonary contents through the buccal cavity, and finally closes the nostrils while pumping the buccal contents into the lungs. The pulmonary efflux streams by the buccal contents with minimal mixing, and relatively pure air is pumped into the lungs. Buccal oscillations serve mainly to flush out the buccal cavity between ventilatory cycles.