Why is insulin not given orally but is injected into the body?

It is broken down by the digestive juices and then utilized by the cells.

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It is large in size.

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It is linked by disulphide bonds.

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None of the above

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Solution

The correct option is A It is broken down by the digestive juices and then utilized by the cells.
If a person is suffering from diabetes due to insufficient production of insulin, then insulin is given externally through injection. However, it is not given orally by mouth because the digestive juices in the stomach and intestine will break down the insulin before it enters the bloodstream.
Thus, the correct answer is 'It is broken down by the digestive juices and then utilized by the cells.'

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