RESPIRATION AND GAS EXCHANGE

        Respiration is an important visible sign of life chemically, this process of complete oxidation of the ATP-the “energy currency of the cell”, is known as respiration. However the mechanical process which comprises both of inhalation or inspirations in the presence of oxygen) or anaerobic (without oxygen) or fermentation (e.g., prokaryotes). It’s carried out with the help of various structures. Some of them are listed as follows.

Respiratory structures in different animals Man, Birds and lizards, etc,- Lungs (alvcoli) Frogs and Toads –Lungs and moist skin Fish and other aquatic organisms –gills Insects –Tracheal network (branches of “air-tubes”) Scorpions –Book Lungs Earthworm –moist skin Amoeba, Plamaria –simple diffusion through cell membrane. As they are very small and thin-walled, gases can directly diffuse.