What is the role of HCl in digestion?

1 Answer

The role of #"HCl"# in digestion;

Explanation:

  • When the bolus enters the stomach, the contraction and expansion of the muscles of the wall of the stomach bring about churning movement with the help of #"HCl"# present in the gastric juice.

  • In the presence of #"HCl"#, pepsinogen gets converted into its active form i.e. pepsin that hydrolyzes protein into peptides.

  • In infants, in presence of #"HCl"#, rennin gets activated into form i.e. prorennin that hydrolyses the soluble milk protein casein into paracasein.

  • Gastric juice also secretes lipase enzyme that converts small amounts of fat into monoglycerides and fatty acids because the enzyme is sensitive to free acid and is destroyed by #"HCl"#.