They obtain food by filter feeding or straining food particles from water. Sponges achieve the goal of digestion through intracellular digestion where food. Sponges are sessile so they cannot pursue their food. Their bodies are covered with pores and canals through which water passes. The water moves in and out.
Sponges have digestive maintaining a constant water flow through their bodies.
Sponges do not have a nervous, digestive or circulatory system. They rely on keeping up a constant water flow through their bodies to obtain food and oxygen . The mobile cells, called amoebocytes, work in concert with the choanocytes to feed the sponge. They digest the food that the choanocytes. The Phylum Porifera (sponges) includes organisms that have these characteristics. Food digestion takes place inside food vacuoles within collar cells.
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