The air bladders are more or less sac like structure lying between the alimentary canal and the kidneys and contain a mixture of carbon dioxide, oxygen and nitrogen. Generally, the gas bladder opens into oesophagus and it is present in all the osteichthyes, except a few.
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Proteins are the complex organic molecules containing carbon, hydrogen, oxygen and nitrogen. However, some proteins also contain phosphorus and sulphur. The fundamentals unit in the case of proteins are amino acids. Proteins are macromolecules with molecular masses generally more than 1000 a.m.u.