What is the role of saliva in digestion?

Saliva (produced by salivary glands) plays critical roles in the first stage of digestion:

• Enzyme action: Salivary amylase (ptyalin) begins breaking down starch into maltose.
• Lubrication: Moistens food to form a soft bolus for swallowing.
• Dissolving food: Taste molecules must dissolve in saliva for taste buds to detect them.
• Cleaning: Washes bacteria from teeth, preventing decay.
• pH: Slightly alkaline right environment for amylase function.

Saliva lubricates food and begins carbohydrate digestion through salivary amylase, starting the digestive process in the mouth.