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Digestion of protein starts from -...

Digestion of protein starts from -

A

Mouth

B

Stomach

C

Small intestine

D

Duodenum

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Protein Digestion**: The digestion of proteins involves breaking down complex protein molecules into smaller peptides and amino acids, which can be absorbed by the body. 2. **Location of Protein Digestion**: The digestion of proteins begins in the stomach. This is a crucial point as it distinguishes protein digestion from other types of digestion that may begin in the mouth or small intestine. 3. **Cells Involved in the Stomach**: In the stomach, there are specific cells that play a role in protein digestion: - **Mucous Neck Cells**: These cells secrete mucus that protects the stomach lining. - **Peptic Cells**: These cells secrete an inactive enzyme called **pepsinogen**. 4. **Activation of Pepsinogen**: When food enters the stomach, it stimulates the secretion of hydrochloric acid (HCl). The acidic environment activates pepsinogen, converting it into its active form, **pepsin**. 5. **Action of Pepsin**: Pepsin is a proteolytic enzyme that begins the process of protein digestion by breaking down proteins into smaller peptides called **peptones** and **proteases**. 6. **Conclusion**: Therefore, the digestion of protein starts in the stomach, where pepsin acts on the proteins present in the food. **Final Answer**: The digestion of protein starts from the stomach. ---
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