Question

Filter feeders, such as sponges, pump water into their body through what structures?

Answer 1

pores

Sponges are filter feeders. They pump water into their body through their pores. The water flows through a large central cavity called the spongocoel  see Figure above  . As the water flows by, specialized collar cells filter out food particles such as bacteria. Collar cells have tiny hairs that trap the particles. They also have a flagellum that whips the water and keeps it moving. Once the food is trapped, the collar cells digest it  see Figure below  . Cells called amebocytes also help digest the food. They distribute the nutrients to the rest of the body as well. Finally, the water flows back out of the body through an opening called the osculum. As water flows through the sponge, oxygen diffuses from the water to the sponges cells. The cells also expel wastes into the water for removal through the osculum.