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Card 6 / 19:
Describe the different cell types and their functions in sponges.
Pinacocytes are epithelial-like cells, form the outermost layer of sponges, and enclose a jelly-like substance called mesohyl. In some sponges, porocytes form ostia, single tube-shaped cells that act as valves to regulate the flow of water into the spongocoel. Choanocytes (“collar cells”) are present at various locations, depending on the type of sponge, but they always line some space through which water flows and are used in feeding.
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