This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
Parasympathetic stimulation induces salivary acinar cells to release the protease: 
Select and explain. 
A. Bradykinin, B. Kallikrein, C. Kininogen, D. Kinin
B: Kallikrein
Answer: B: Kallikrein 
Explanation: Ans. B. KallikreinParasympathetic stimulation induces the release of kallikrein by the salivary acinar cells, which converts kininogen to form lysyl-bradykinin (a potent vasodilator). Bradykinin is a vasoactive peptide. Kininogen is the precursor for kinins. Kinins include bradykinin and lysyl-bradykinin. Aminopeptidase releases amino acids from the amino end of peptides and is found in the brush border membrane and cytoplasm of enterocytes