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Answers
More on Sponges
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Label Sponge Cross Section Diagram
Using the definitions listed below, label the sponge diagram.
A page on sponges

Sponge to label

archaeocyte (amoebocyte) - Cells with pseudopods, located in the mesohyl. They are used in processing food, distributing it to other cells, and for other functions.
choanocyte - also called the collar cell, thse cells line the inner cavity of the sponge and have a flagellum. The sponge obtains its nutrients and oxygen by processing flowing water using choanocytes.
epidermis (pinacocyte) - the epidermis is the layer of cells that covers the outer surface of the sponge. The thin, flattened cells of the epidermis are called pinacocytes.
flagellum - the whip-like structure of a choanocyte; the flagellum moves, pushing water (which contains nourishment) through the sponge.
mesohyl (mesenchyme) - the gelatinous layer between the outer body of the sponge and the spongocoel (the inner cavity).
spicule - spicules are sharp spikes (made of calcium carbonate) located in the mesohyl. Spicules form the "skeleton" of many sponges.
spongocoel - the central, open cavity in a sponge through which water flows.
water flows in through porocytes - water flows into a sponge through cells with pores (these cells are called porocytes) located all over its body.
water flows out through the osculum - water flows out of a sponge through large openings called oscula (plural).



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