Label Sponge Cross Section Diagram
Using the definitions listed below, label the sponge diagram.
[Type a quote from
the document or the
summary of an
interesting point.
You can position
the text box
anywhere in the
document. Use the
Text Box Tools tab
to change the
formatting of the
pull quote text box.]
A page on sponges
[Type a quote from the
document or the
summary of an
interesting point. You can
position the text box
anywhere in the
document. Use the Text
Box Tools tab to change
the formatting of the pull
quote text box.]
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).