Thursday, December 25, 2008

FROG’S BREATHING UNDER WATER

Frog is an amphibian i.e.. it can live both in land and in water. Everybody have some doubt in how they breathe under water. Let me clear this doubt for you. Frog has lungs as every human being but it doesn’t have ribs for expanding its chest which in turn helps in breathing through lungs. On land the air is inhaled only through frog’s nostrils which have valves in them by pulsation of the floor of the mouth. The air is inhaled and exhaled only by the throat and body muscles to the lungs. It always keeps its mouth shut tightly so the pulsation of the throat is about is 120-140 per minute. In water the frog is inhaled only through their skin. And even in land it is helping out in sometime. the frog’s skin should not be dry as it dies so the skin contains glands which secrete a clear mucus or slime whose function is to keep the skin moist and supple. The frog is a cold-blooded reptile. So it can change its temperature depending on its surrounding. In winter they hibernate under water, where the temperature of its body falls, thereby the body functions become reduced and breathing is carried out on entirely through skin.

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