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More on Sponges
Label Sponge External Anatomy Diagram
Using the definitions listed below, label the sponge and the flow of water through it.
A page on sponges

Sponge to label

epidermis - the layer of cells that covers the outer surface of the sponge. The thin, flattened cells of the epidermis are called pinacocytes.
holdfast - root-like tendrils that attach the sponge to rocks.
osculum - the large openings in a sponge through which water flows out of the sponge. Sponges may have more than one oscula.
water flows in - water flows into a sponge through pores (holes) located all over its body. The sponge obtains its nutrients and oxygen by processing this flowing water.
water flows out - water flows out of a sponge through large openings called oscula.

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