How do sponges work? When you put a sponge in water, it absorbs it. Water won’t be released until someone forces it out through squeezing or it could be allowed to dry out over time. This happens because the bubble like spaces inside the sponge have the ability to hold water and the sponge material locks it in. Water enters the projections directly through pores, makes its way into the central cavity, or spongocoel, and leaves by way of an osculum. Water enters very small pores found among the cells (pinacocytes), which line the outer surface of the sponge. The chambers, scattered throughout the body of the sponge, have pores through which water passes into a complex system of incurrent canals, then into a spongocoel (internal cavity) by way of excurrent canals. How does water go in and out of a sponge? Sponges create the current that draws water into the pores using many collar cells, each cell with a whip-like structure called a flagellum and a collar. Water is drawn into the sponge through tiny holes called incurrent pores. The water carries wastes away from the sponge. Water leaves the sponge through the osculum, a large opening. Water enters the small pores throughout the sponge’s body. The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system) the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food and the oscula, openings through which water is expelled (excurrent … How does water enter and exit a sponge? What moves water currents through a sponge?
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