Question

The function of Rennin is
a) Vasodilation
b) Reduce blood pressure
c) Degradation of angiotensin
d) None of these

Answer 1

Hint: Rennin is also known as chymosin and it is an enzyme present in the gastric juice.

Complete answer:
Rennin is a proteolytic enzyme which brings about digestion of milk. It is secreted as inactive Prorenin which is activated to rennin by Hydrochloric acid. Rennin is an enzyme found in young children. The milk consumed by infants is curdled in the stomach using rennin. Commercially prepared rennin is used for making curd, yoghurt and cheese. This enzyme is also known as chymosin.

Function:
Soluble protein in milk (casein) is converted to insoluble protein (paracasein) by activity of rennin. Pepsin then acts on this insoluble protein to carry out complete digestion.
The function of rennin is not mentioned in the above options.

 Thus the correct answer for this question is option D- None of these.

Additional information:
- All the biochemical reactions in our body are catalyzed by some protein complexes that are known as enzymes. Enzymes are of various classes and they have specific functions in our body. Proper stability of enzymes is necessary for proper functioning of the organ systems.

- A proteolytic enzyme is an enzyme that is capable of breaking the bonds in proteins and splitting them into peptides. Some common proteolytic enzymes are rennin, chymotrypsin etc.

- Rennin is often confused with the enzyme renin which is produced by the kidneys. Renin is also a proteolytic enzyme but its function is to convert angiotensinogen to angiotensin-II. The effects of renin activity include vasoconstriction, increase in arterial blood pressure etc.

Note: The enzyme rennin is often confused with rennin. But they both are very different. Rennin is a digestive enzyme present in the digestive juice whereas renin is secreted by kidneys and controls the renin-angiotensin- aldosterone system.