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Ptyalin cannot work in stomach, because ...

Ptyalin cannot work in stomach, because it becomes -

A

Inactive due to HCl

B

Inactive due to renin

C

Inactive due to pepsin

D

None of these

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Ptyalin**: Ptyalin, also known as salivary amylase, is an enzyme produced by the salivary glands that helps in the digestion of starch into simpler sugars. 2. **Location of Action**: Ptyalin primarily functions in the mouth, where the pH is neutral to slightly acidic (around 6.8 to 7). This environment is conducive for the enzyme to be active and perform its function effectively. 3. **Conditions in the Stomach**: When food reaches the stomach, it encounters a highly acidic environment due to the presence of hydrochloric acid (HCl). The pH in the stomach ranges from approximately 1.8 to 2, which is very acidic. 4. **Effect of pH on Ptyalin**: The highly acidic pH in the stomach denatures the ptyalin enzyme, rendering it inactive. Enzymes have specific pH ranges in which they function optimally, and ptyalin's optimal pH is not compatible with the acidic conditions of the stomach. 5. **Conclusion**: Therefore, the reason ptyalin cannot work in the stomach is that it becomes inactive due to the presence of hydrochloric acid (HCl). 6. **Final Answer**: The correct answer is option 1: "inactive due to HCl". ---
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