Beta cells reside in the pancreas, where they do the important job of producing insulin for the body. Beta cells produce insulin, and also secrete insulin when they are signaled to do so by an increase in glucose levels in the blood.Without adequate insulin, blood glucose levels rise too high, a defining characteristic of any type of diabetes.eta cells reside in the pancreas, where they do the important job of producing insulin for the body. Beta cells produce insulin, and also secrete insulin when they are signaled to do so by an increase in glucose levels in the blood.
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Definition of nullify (nullified) in the AudioEnglish.org Dictionary. Meaning of nullify. What does nullify mean? Proper usage and pronunciation (in phonetic transcription) of the word nullify. Information about nullify in the AudioEnglish.org dictionary, synonyms and antonyms.