<Li> Secretory cells in the pancreas </Li> <Li> Secretory glands in the small intestine </Li> <P> Complex food substances that are taken by animals and humans must be broken down into simple, soluble, and diffusible substances before they can be absorbed . In the oral cavity, salivary glands secrete an array of enzymes and substances that aid in digestion and also disinfection . They include the following: </P> <Ul> <Li> lingual lipase: Lipid digestion initiates in the mouth . Lingual lipase starts the digestion of the lipids / fats . </Li> <Li> Salivary amylase: Carbohydrate digestion also initiates in the mouth . Amylase, produced by the salivary glands, breaks complex carbohydrates to smaller chains, or even simple sugars . It is sometimes referred to as ptyalin . </Li> <Li> lysozyme: Considering that food contains more than just essential nutrients, e.g. bacteria or viruses, the lysozome offers a limited and non-specific, yet beneficial antiseptic function in digestion . </Li> <Li> Haptocorrin (also known as R - factor): Helps with the absorption of vitamin B12 . After Vitamin B12 is released from its original carrier protein in the stomach, it gets bound to haptocorrin . Haptocorrin protects it from acidic conditions of the stomach but is cleaved in the duodenum by pancreatic proteases . Vitamin B12 can then bind to intrinsic factor (IF) that has been produced by parietal cells . Finally, the IF - Vitamin B12 complex is taken up by in ileum via the cubam receptor . </Li> </Ul>

What are the different digestive enzymes and their functions