Ptyalin cannot act in the stomach because it | vedclass

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(A) $Ptyalin$ (salivary amylase) is an enzyme present in saliva that works optimally at a slightly alkaline $pH$ of about $6.8$. In the stomach,the ga

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Inactivated due to $HCl$

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(A) $Ptyalin$ (salivary amylase) is an enzyme present in saliva that works optimally at a slightly alkaline $pH$ of about $6.8$. In the stomach,the gastric glands secrete $HCl$,which makes the environment highly acidic ($pH$ of $1.5$ to $2.5$). This acidic environment denatures the $Ptyalin$ enzyme,rendering it inactive. Therefore,the digestion of starch by $Ptyalin$ stops in the stomach.

Ptyalin cannot act in the stomach because it becomes $......$.

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