Respiratory System of Frog | Biology - Zoology

Zoology | Biology Notes
Respiratory System of Frog
Class 11

The process of gaseous exchange (O2 and CO2) and utilization of oxygen to breakdown food to release energy is called respiration. The process of respiration involves three stages. 

External respiration 

It also refers to breathing. In this process, the O2 is taken into the body and the CO2 is thrown out from the body into the environment.

Internal respiration 

It refers to utilization of O2 to break down food to release energy and release of CO2 during the process. 

Transport of gases 

It refers to transportation of O2 from the respiratory surface to the cell and tissues and the CO2 from cell and tissues to the respiratory surface. There are three types of respiration in frog 

1. Coetaneous respiration 

• The respiration through skin is called coetaneous respiration. 
• The coetaneous respiration occurs in hibernation and aestivation and in water. 
• The skin of frog is thin and vascularised (skin is supplied with fine blood vessels). 
• The skin is always becomes moist by mucous secreted from the mucous glands. 
• Due to moist skin, the oxygen from the environment diffuses into the blood through skin and the carbondioxide diffuses out from the blood into the environment. 

2. Buccopharyngeal respiration 

• The respiration through the buccopharyngeal cavity is called buccopharyngeal respiration. 
• The buccal cavity consists of moist mucous membrane and richly supplied with blood vessels. 
• The air enters into the cavity through nares and gaseous exchange takes place through the lining of buccal cavity between blood and air present in the cavity. 

3. Pulmonary respiration 

• The respiration through the lungs is called pulmonary respiration. 
• This respiration occurs only when the need of oxygen is more during swimming and jumping. 
• There is a pair of lungs. The lungs are thin walled elastic sacs. They are present within thoracic cavity on either side of heart. 
• Numerous small air sacs are present in the lungs called alveoli. 
• The alveoli are very thin walled and supplied by blood vessels. The air enters into the alveoli of the lungs through the external nares, internal nares, buccopharyngel cavity, glottis, laryngotrachial camber, and bronchi. 

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