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What is the Estimated Average Requirement (EAR) in the context of human nutrition?
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23. The Digestive System
Introduction to the Digestive System
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What is the inactive precursor of pepsin in the digestive system?
A
Trypsinogen
B
Chymotrypsinogen
C
Pepsinogen
D
Procarboxypeptidase
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Understand that pepsin is an enzyme involved in the digestive process, specifically in breaking down proteins in the stomach.
Recognize that many digestive enzymes are secreted in an inactive form to prevent them from digesting the tissues of the organs that produce them.
Identify that the inactive form of pepsin is called pepsinogen. This is a zymogen, which is an inactive precursor of an enzyme.
Learn that pepsinogen is secreted by the chief cells in the stomach lining and is activated to pepsin when it comes into contact with hydrochloric acid in the stomach.
Differentiate pepsinogen from other zymogens like trypsinogen, chymotrypsinogen, and procarboxypeptidase, which are precursors to other digestive enzymes.
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