And what interkinase does is it basically Cleaves, a specialized type of zymogen known as Tripsinogen. And it activates trypsinogen and transforms it into trypsin. And trypsin is a very important type of proteolytic enzyme as we'll see in just a moment. That ultimately not only cleaves peptide bonds but it also activates many other proteolytic enzymes in our digestive system. Now let's discuss the three important types of hormones that are produced by the small intestine and which actually stimulate the process of digestion. Let's begin with a peptide hormone known as secretin.