Question

Rennin is found in

(a) Liver

(b) Kidney

(c) Pancreatic

(d) Gastric juices in the stomach

Answer 1

Hint: Rennin is an enzyme found mostly in infants which helps in the digestion of milk proteins.

Complete answer:

Rennin is a proteolytic enzyme found in the gastric juice in the stomach of infants which helps in the digestion of Casein (milk protein). Rennin is also known as Chymosin synthesized by the chief cells.

- Its role in digestion is to curdle or coagulate milk in the stomach, which is very important in very young animals.

- Rennin secretions are maximal in the first few days after birth, later declines, and thereafter is replaced by the pepsin.

- Rennin is secreted as an inactive proenzyme called prochymosin and activated on exposure to the acidic medium.

- The end product of the substrate milk protein is calcium paracaseinate.

- A human being can digest lactose present in milk but with advancing age, they also cannot digest milk because less lactase is produced.

- Lactose remains undigested and gets fermented in the intestine producing gasses and acids. This results in flatulence, intestinal cramps, and diarrhea.

So, the correct answer is option (D), ‘Gastric juices in the stomach’.

Additional Information:

- Liver is responsible for producing bile which helps in digestion of fats and converting into usable forms of energy. Moreover, liver is also known for producing albumin.

- Kidney releases Renin, responsible for regulating blood pressure.

- Exocrine glands in the pancreas make digestive enzymes. These enzymes comprise amylase for carbohydrate digestion, trypsin and chymotrypsin for protein digestion, and lipase for fat digestion.

Note: Rennin and Renin are two separate enzymes secreted by two different organs. Rennin is an enzyme secreted by the fundic glands to digest milk protein whereas Renin is an enzyme secreted by the kidneys in response to hypotension which makes up Renin Angiotensin Aldosterone System.