1. Enzymatic digestion of proteins in to amino acids by pepsin. 3. Secretion of bile. 4. Enzymatic digestion of triglycerides to fatty acids and glycerol by gastric lipase. 8. Secretion of HCl. Solution 1. Enzymatic digestion of proteins in to amino acids by pepsin. 3. Secretion of bile. 4. Enzymatic digestion of triglycerides to fatty acids and glycerol by gastric lipase. 8. Secretion of HCl..