What enzyme is responsible for carbohydrate digestion in the mouth?

The enzyme responsible for carbohydrate digestion in the mouth is amylase. Salivary amylase, specifically produced by the salivary glands, initiates the process of breaking down complex carbohydrates, such as starches, into simpler sugars like maltose and dextrin. This enzymatic action occurs as food is chewed and mixed with saliva, allowing for easier digestion once the food reaches the stomach and small intestine.

The other options listed do not serve this function. Protease is involved in protein digestion, lipase is responsible for fat digestion, and cellulase, although an enzyme that breaks down cellulose, is not produced in significant amounts in humans and is not involved in the digestion of carbohydrates. Thus, salivary amylase is key in starting the digestive process for carbohydrates right in the mouth.