Question

why insulin has to be injected rather than ingested orally?

-biology

Answer 1

Insulin cannot be given orally due to the following reasons:

Explanation:

• Insulin is a peptide hormone which means that is made up of peptides.
• If insulin is given orally, then the peptide digesting enzymes of the digestive system will digest the insulin and it will not be able to reach the site of action.
• Hence, insulin is injected into the blood stream which makes the working of insulin effective.

Answer 2

Explanation:

Insulin cannot be taken by mouth and swallowed because the digestive juices in the stomach and intestine will break down and digest the insulin protein completely before it has a chance to get into your bloodstream to do its task. Hence, insulin is taken in the form of injection and not directly through the mouth.