The digestion of protein begins in the stomach.
Hence Option (a) is correct
Pepsin, an enzyme, acts in the stomach to start the enzymatic digestion of proteins.
The hydrochloric acid and pepsin enzyme found in gastric juices, which are released by the stomach, start the chemical digestion of protein.
Peristalsis, or muscle contractions, are also helpful for digestion. Strong stomach contractions combine the partially digested protein into a more consistent mixture known as chyme.
Its pH ranges from 1.5 to 3.5, which is extremely low due to the hydrochloric acid in the stomach.
Food proteins denature in the stomach's acid, revealing only the polypeptide chain by unfolding their three-dimensional structure.
This is the initial phase of the chemical breakdown of proteins. Remember that a protein's three-dimensional structure is crucial to its functionality; therefore, denaturation in the stomach also eliminates protein activity.
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