The process in which food is digested outside the cells inside the stomach, alimentary canal and celandine is called extracellular digestion. As soon as the food material reaches the cilentron, the mouth pore closes. The prey or food is killed by the action of the enzyme. The contraction and expansion of the body wall breaks the prey into smaller particles. Food is digested under the influence of enzymes secreted from glandular cells. Proteins are broken down into polypeptides. Lipid food is not digested here. Dr. Siddiq Publications