Final answer:
Collar cells, also known as choanocytes, are the specialized cells in sponges responsible for bringing water into the central cavity and filtering food particles.
Explanation:
Collar cells, also known as choanocytes, are the type of cells that bring water into the central cavity of a sponge. These cells have tiny hairs that trap food particles and a flagellum that whips the water, aiding in its movement through the sponge.
Choanocytes are present at various locations within the sponge body, lining the inner portions through which water flows. They play a critical role in generating a directed water current through the sponge and filtering food particles.
The structure of a choanocyte includes a mesh-like collar composed of microvilli with a single flagellum in the center, which draws water into the sponge and helps in the feeding process.
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