Digestion and Absorption Question 60

60. Renin acts on

[1994]

(a) milk changing casein into calcium paracaseinate at $7.2-8.2 pH$

(b) proteins in stomach

(c) fat in intestine

(d) milk changing casein into calcium paracaseinate at $1-3 pH$.

Show Answer

Answer : d

Hints & Solution

(d) Renin acts on milk protein casein & changes it into paracasein spontaneously precipitating into insoluble calcium paracaseinate, forming solid curd or coagulated milk. Renin is present in the gastric juice and hence works in highly acidic $pH$ (due to $HCl$ ) in stomach (about 1-3 pH) and is absent in adult human being.