The part of the sponge the water flows in is the hole.
Water is moved through a sponge's central cavity, known as the spongocoel, by the action of specialized cells called choanocytes. These cells have flagella that beat rhythmically, creating a flow of water into the sponge through small openings called ostia. As water flows through the spongocoel, it is filtered for nutrients and oxygen, which are absorbed by the sponge's cells. The filtered water then exits through a larger opening called the osculum.
flagella
Water is brought through cilia-lined pores into the hollow cavity of the sponge. As water passes through the pores, the cilia trap oxygen to breathe
osculum - a large opening in a sponge through which water flows out of the sponge. Sponges may have more than one oscula.
A flagellated cell that sweeps water through a sponge's body is called a choanocyte. Choanocytes have a flagellum that creates a current to bring water through the sponge's pores, allowing for filter feeding and gas exchange to occur within the sponge's body.
Allow materials to enter and leave the sponge
Sponges have flagellated cells over the surface of their bodies, these are cells that have tails that wiggles. The collective effort of all these cells creates a water current through the many porous openings in the sponges body. It is a water based circulatory system.
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Facts From : Staight a student ok here are the answers....System TypeSponges SystemMuscular-SkeletalA sponge is a hollow tube with many pores or openings. The skeleton is made of lime or silicon.DigestionA sponge takes in food via the water that flows through the pores.NervousA sponge has a very low level reaction to the world around it and does not have a brain per se.CirculationA sponge has water flow in through the pores. The water contains the food and oxygen the sponge needs.RespirationA sponge takes in water through its pores and in more advanced forms, with canals that move the water to all throughout the sponge. Then the oxygen from the water is used.ReproductionA sponge reproduces by budding and also sexually.ExcretionA sponge has carbon dioxide and other wastes removed as the water moves in and out through the pores.SymmetryA sponge has either radial symmetry or is asymmetrical.ColorationA sponge is white, red, orange, green, yellow, brown, purple, black (colors)
Choanocyte (collar cells) are any of the flagellated cells located in the body cavity of a sponge. They surround the base of the flagellum. The function of these cells is to maintain the flow of water through the body of the sponge.
Choanocyte (collar cells) are any of the flagellated cells located in the body cavity of a sponge. They surround the base of the flagellum. The function of these cells is to maintain the flow of water through the body of the sponge.