How is Water Moved Through the Sponge Body

Question

How is water moved through the sponge body?
A) by tidal action
B) by the flagella of the collar cells
C) by the spicules, which create the water flow
D) by the muscles surrounding the osculum
E) by expansion and contraction of the body

Accepted Answer

Water is moved through the sponge body by the beating of flagella on the choanocytes, or collar cells, which line the internal chambers of the sponge. This action draws water in through the sponge's pores, allowing it to filter out food particles.