Saliva, secreted by salivary glands, plays a role in wetting and processing food. It contains an enzyme called salivary amylase, which breaks down complex starch molecules into simple sugars.

Crushing food with our teeth is essential to generate small, uniformly textured particles, facilitating smooth passage through the digestive tract.

In Paramoecium, food is taken in at a specific spot facilitated by cilia movement covering the cell surface, unlike the entire surface feeding seen in Amoeba.

Amoeba takes in food through temporary extensions of the cell surface, forming a food vacuole. Complex substances inside the food vacuole are broken down into simpler ones, diffusing into the cytoplasm, and undigested material is expelled at the cell surface.