Explain the respiratory system of Rana hexadactyla .

Explanation

Frog respires on land and in the water by two different methods . In water , skin acts as aquatic respiratory organ (cutaneous respiration ) . Dissolved oxygen in the water gets , exchanged through the skin by diffusion . On land , the buccal cavity , skin and lungs act as the respiratory organs . In buccal respiration on land, the mouth remains permanently closed act as the respiratory organs . The floor of the buccal cavity is alternately raised and lowered , so air is drawn into and expelled out of the buccal cavity repeatedly through the open nostrils . Respiration by lungs is called pulmonary respiration . The lungs are a pair of elongated , pink coloured sackile structures present in the upper part of the trunk region ( thorax ) . Air enters throurgh the nostrils into the buccal cavity and then to the lungs . During aestivation and hibernation gaseous exchanges takes place through skin .