Sponges (Porifera) {sponge, animal} are Ecdysozoa protostomes, live in ocean, are slimy, have bad smells, have porous skeletons, and have drab colors. Sponges have no body symmetry.
cells
Sponges have cellular differentiation for reproduction, food gathering, and skeleton production but no special tissues.
association
Sponges are ectomesenchymal-cell associations. Specialized intercellular junctions are within mesenchyme.
pores
Sponges take in water and food through skeleton pores. They force water out other pores. Pore epithelio-muscular cells and oscular sphincters regulate water flow.
Spindle-shaped and neuron-like mesenchymal cells are adjacent to pinacocytes and choanocytes. Large multipolar neuron-like cells are in collar below osculum. The neuron-like cells contain small, granular vesicles and norepinephrine, epinephrine, serotonin, acetylcholinesterase, and monoamine oxidase.
sensation
Sponges have cells that react to stimuli but no cell coordination.
Biological Sciences>Zoology>Kinds>Sponge
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Date Modified: 2022.0224