Biology / Unit 10 Bio 2237 short lesson, about 20 seconds
Phylum Porifera: Body Structure without True Tissues
Captions available
The idea
A sponge's body lacks true tissues and organs, relying on pores and internal water channels lined by flagellated cells to filter food.
In practice
A sponge's choanocytes beat their flagella to draw water through the body, trapping food particles as it passes.
Where people slip
Lacking true tissues does not exclude sponges from Animalia — they still develop from a blastula, sharing the kingdom's other features.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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