Physiology Which of the following statements is true about protein digestion? A Protein digestion stas with the salivary action B Trypsinogen is conveed to trypsin by the action of bicarbonate in duodenum C Trypsin and chymotrypsin are exopeptidases D 10%-20% protein digestion occurs by pepsin action in stomach. 💡 Explanation Which of the following statements is true about protein digestion? ✓ Correct Answer: D. 10%-20% protein digestion occurs by pepsin action in stomach.