How does renin work?

Rennin is primarily associated with curdling of milk. The digestive systems of young ones are not developed. Hence, there is a chance that the milk may flow out of the body, without any absorption of nutrients. If this happens, the baby will be deprived of the vital nutrients in milk, which may affect her growth. To prevent this, it is necessary that the milk should stay in the body for a longer time. This is possible only when the milk is in the curdled form. This function is carried out by rennin. Interestingly, the conversion of milk into curd is possible only at 37 degree Celsius, which is the temperature of human body.