In sponges, where does the water enters?
Ostia
In sponges, water enters through tiny pores called ostia. The ostia are located on the surface of the sponge and lead into a system of canals and chambers that make up the sponge’s internal structure. As water enters through the ostia, it flows through these canals and chambers, bringing in oxygen and nutrients while removing waste products. Filter-feeding cells called choanocytes line the interior of these canals and use their flagella to create a current that draws in water and captures food particles. Eventually, the filtered water exits the sponge through a larger opening called the osculum.
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