Question

In which of the following structures protein digestion first occurs?

• A. Mouth
• B. Stomach
• C. Large intestine
• D. Small intestine

Answer 1

The correct option is B Stomach

• Digestion involves the mixing of food, its movement through the digestive tract, and the chemical breakdown of the large molecules of food into smaller molecules.
  
• Digestion begins in the mouth when we chew and swallow, and then it is passed on to the stomach where digestion takes place by gastric juices and enzymes secreted by the stomach and then it is passed to the small intestine where the digestion is completed.
• Pepsin is an enzyme which is released by zymogenic cells, the chief cells in the stomach and that degrades food proteins into peptides. Hence, the stomach is the structure where the protein digestion first occurs.

So, the correct answer is 'Stomach'.