What is the primary role of saliva in digestion?

Saliva plays a vital role in the initial stages of digestion, particularly in the breakdown of carbohydrates. It contains an enzyme called amylase, which specifically targets starches and begins converting them into simpler sugars. This enzymatic action starts in the mouth, where food is mixed with saliva, creating a bolus that can be easily swallowed. As a result, the primary function of saliva is to initiate the digestion of carbohydrates, setting the stage for further digestion as food moves through the digestive tract.

While saliva does have additional functions, such as lubricating food for easier swallowing and providing antibacterial properties, its most significant role in digestion is the breakdown of carbohydrates, making this option the correct choice.