QS Study

Bucco-pharyngeal Respiration System of Toad:

The membrane of buccal cavity and pharynx of toad is very thin and there are innumerable capillaries. When air enters the buccal cavity oxygen gets into the blood of the capillaries by diffusion. This oxygenated blood flows to different parts of the body through the heart and at one stage takes part in the oxidation of food inside the cell.


fig: Bucco-pharyngeal Respiration System

The carbon dioxide produced as a result of oxidation of food comes out through diffusion. The toad respires this way generally during rest. Bucco-pharyngeal respiration occurs through the lining of this mouth. This only occurs in the event the frog is certainly not submerged in water.

The lining on the mouth is quite moist and can often bring oxygen into the bloodstream by dissolving the idea and diffusing it into the blood capillaries, in the same way to the epidermis or skin respiration system.