Rennin is secreted in which part of alimentary canal?
a)	Stomach	b)	Kidney	c)	Duodenum	d)	Small intestine

(a)

The rennin is present in proenzyme form (prorennin) in the gastric juice secreted by gastric glands of stomach. The HCl present in the gastric juice converts prorennin into rennin, which acts on casein (milk protein) and converts it into calcium paracaseinate. Rennin is present in infants and absent in adults.