What role does rennin play in the digestive process?

Rennin, also known as chymosin, is an enzyme that plays a critical role in the digestive process, particularly in the stomach of young mammals. Its primary function is to curdle milk, which is essential for infants who rely on milk as their primary source of nutrition. By curdling milk, rennin aids in the digestion of dairy by converting the liquid form of milk into a semi-solid curd. This process slows down the passage of milk through the digestive system, allowing for more efficient nutrient absorption.

The curdling of milk also makes it easier for other digestive enzymes, like pepsin, to access and break down the proteins within the curds. This is particularly important in the early stages of life when infants have a diet predominantly made up of milk.

While other substances in the body are responsible for breaking down carbohydrates and fats, rennin's specific function is focused on curdling milk and facilitating the digestive process associated with consuming dairy products.