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Which one of the following is the first enzyme to mix with food in the

June 1, 2025 by rawan239

Which one of the following is the first enzyme to mix with food in the digestive tract?

Trypsin

Cellulose

Pepsin

Amylase

This question was previously asked in

UPSC CDS-1 – 2020

Download PDF Attempt Online

Digestion begins in the mouth, where food is chewed and mixed with saliva. Saliva contains the enzyme salivary amylase (also known as ptyalin), which starts the enzymatic breakdown of carbohydrates (starch) into simpler sugars. Other enzymes listed, such as pepsin (in the stomach) and trypsin (in the small intestine), act later in the digestive tract. Cellulose is a type of carbohydrate, not a human digestive enzyme.

– The mouth is the beginning of the digestive tract where food mixes with saliva.
– Saliva contains salivary amylase (ptyalin).
– Salivary amylase starts the digestion of starch.
– Pepsin acts in the stomach, and trypsin acts in the small intestine.

Salivary amylase works best in a slightly alkaline to neutral pH (around 6.7 to 7.0) present in the mouth. Its activity is inhibited by the acidic environment of the stomach. Although carbohydrate digestion starts in the mouth, it is completed in the small intestine by pancreatic amylase.

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