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Describe the process of digestion of pro...

Describe the process of digestion of proteins in the stomach.

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The gastric glands of stomach secrete acidic gastric juice. Gastric juice contains HCl, prorenin, pepsinogen and bicarbonates.
Proenzymes pepsinogen and prorennin, on exposure to HCl are converted into the active enzymes, pepsin and rennin respectively.
Pepsin converts proteins into proteoses and peptones, Rennin is found in gastric juice of infants dteacts on milk protein casein in the presence of calcium ions and converts it into calcium paracaseinate (curd) and proteoses. Pepsin again acts on cálcium para-caseinate and converts it into peptones. Certain other cells in the wall of stomach produce bicarbonate, a base to buffer the acidic contents of the stomach. Bicarbonates and mucus produced by stomach wall forms a physical barrier to prevent HCl from damaging the wall of stomach.
Prorennin (inactive) `overset(HCl)to` Rennin (active)
Pepsinogen (inactive) `overset(HCl)to` Pepsinin (active)
Casein `underset(Ca^(+2))overset("Rennin")to` Calcium paracaseinate (curd)
Calcium paracaseinate `overset("Pepsin")to` Peptones.
Proteins `overset("Pepsin")to` Proteoses + Peptones
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