Which enzyme initiates the digestion of milk in humans?

Pancreatic secretion and gall bladder contraction are stimulated by

How many of the following enzymes are proteolytic?
Amylase,Lipase,Pepsin,Trypsin,Chymotrypsin,Carboxypeptidase,Maltase,Erepsin

How is the process of digestion regulated by the gastrointestinal tract?

$A -$ Secretin acts on the exocrine pancreas and stimulates the secretion of water and bicarbonate ions. $R -$ Cholecystokinin $(CCK)$ acts on both the pancreas and the gall bladder and stimulates the secretion of pancreatic enzymes and bile juice,respectively.

The duodenum has characteristic Brunner's glands which secrete two hormones called: