![]() ![]() The small pores, called ostia, of the sponge draw water into them, and the water is circulated throughout its body by the action of cells called choanocytes. How does the movement of nutrients oxygen and waste happens throughout the sponge body and into and out of the cells? Waste products are expelled through the osculum by the current created by the choanocytes to pull water into the sponge. Once inside, they diffuse to individual cells. The gases diffuse through the surface of the sponge. Sponges use direct diffusion to exchange gases. How do waste products move out of a sponge? Sponges use the water current and the process of diffusion to absorb oxygen from the water and to get rid of their metabolic waste products. ![]() How do sponges obtain oxygen and get rid of wastes?Ĭells in the sponge walls filter oxygen and food (bacteria) from the water as the water is pumped through the body. ![]()
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