Which of the following enzymes carries out the initial step in the digestion of milk in humans?
In humans milk protein digesting enzyme in stomach is pepsin. Rennin is present in small amounts in human infants but not adults. Pepsin acts on water soluble caseinogen (milk protein) to form solubles 'casein'. This combines with calcium salts to form insoluble calcium paracaseinate, which gets readily digested enzymatically.