Fill in the blanks : (1)……. `overset"Ptyalin"to` (2) ………..

Explanation

### Step-by-Step Text Solution:

1. **Identify the Enzyme**: The enzyme in question is "Ptyalin," which is also known as "salivary amylase." This enzyme is present in saliva and plays a crucial role in the digestion of carbohydrates.

2. **Understand the Function of Ptyalin**: Ptyalin helps in the breakdown of complex carbohydrates, primarily starch, into simpler sugars. This process begins in the mouth as food is chewed and mixed with saliva.

3. **Fill in the First Blank**: The first blank can be filled with "starch," as this is the complex carbohydrate that Ptyalin acts upon.

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