The Single Large Opening at the Top of the Spongocoel

Question

The single large opening at the top of the spongocoel is the
A)osculum.
B)atriopore.
C)ostium.
D)mouth.
E)anus.

Accepted Answer

The single large opening at the top of the spongocoel is called the osculum. This is where the water exits the sponge after filtering organic matter through the choanocytes. Options B, C, D, and E are incorrect because they are not the correct anatomical terms for the sponge's opening.