A tadpole lives under water so it only has one way of gas exchange (through the gills). First, the tadpoles open their mouth to let water enter. Then, the water moves into the gills which contain small membranes called lamellae. The lamellae extract oxygen from the water and the oxygen is diffused into the blood stream. Tadpoles can also rise to the surface and gulp oxygen from the air. As the tadpole matures, the gills are absorbed by the body and new respiratory organs are grown.
Frogs meanwhile, have three different types of respiration. In cutaneous respiration the frog breathes through its skin. This is where most of the respiration takes place. The skin contains many blood vessels in which oxygen can be diffused. The skin has mucus which helps in extracting the oxygen from the air. Next is buccopharyngeal respiration, which occurs in the lining of the mouth. This cannot occur when the frog is submerged in water. The moist lining of the mouth can dissolve the oxygen and diffuse it into the blood stream. Finally there is pulmonary respiration which is breathing with the lungs. The lungs are generally not used a lot in frogs and are underdeveloped. Since there is no diaphragm and air pressure cannot be controlled, they use the mouth, gullet and nostrils to push air into and out of the lungs. To breathe with the lungs, first the base of the mouth is lowered to enlarge the buccal cavity, and then the nares are opened to allow air inside. The base of the mouth moves back up, which forces the air through the glottis and into the frog lungs.
In conclusion to this system, the main differences in respiration are that frogs have three methods of breathing while tadpoles only have two and that tadpoles breathe more like fish, using their gills.
We were able to find the frog lungs during the dissection.There is a picture of the right lung shown above. Shown below is a view of the frogs respiratory system from the pulmonary respiration. The picture came from this link:
http://standardnote.blogspot.ca/2012/12/respiratory-system-of-frog.html
Frogs meanwhile, have three different types of respiration. In cutaneous respiration the frog breathes through its skin. This is where most of the respiration takes place. The skin contains many blood vessels in which oxygen can be diffused. The skin has mucus which helps in extracting the oxygen from the air. Next is buccopharyngeal respiration, which occurs in the lining of the mouth. This cannot occur when the frog is submerged in water. The moist lining of the mouth can dissolve the oxygen and diffuse it into the blood stream. Finally there is pulmonary respiration which is breathing with the lungs. The lungs are generally not used a lot in frogs and are underdeveloped. Since there is no diaphragm and air pressure cannot be controlled, they use the mouth, gullet and nostrils to push air into and out of the lungs. To breathe with the lungs, first the base of the mouth is lowered to enlarge the buccal cavity, and then the nares are opened to allow air inside. The base of the mouth moves back up, which forces the air through the glottis and into the frog lungs.
In conclusion to this system, the main differences in respiration are that frogs have three methods of breathing while tadpoles only have two and that tadpoles breathe more like fish, using their gills.
We were able to find the frog lungs during the dissection.There is a picture of the right lung shown above. Shown below is a view of the frogs respiratory system from the pulmonary respiration. The picture came from this link:
http://standardnote.blogspot.ca/2012/12/respiratory-system-of-frog.html