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21 Cards in this Set

  • Front
  • Back
Which phylum do sponges belong to?


What peticular character do all animals except for sponges have?

"True"/specialized tissues

What word describes the movement of sponges? What does it mean?

Sessile; they do not move.

How do sponges feed? What kind of digestion do they have?

Sponges are filter feeders.

They are the only animals that have intracellular digestion.

Are sponges marine or freshwater?

Most are marine, but some are freshwater

How many layers of cells to sponges have? What separates them?

Two; Mesoglea

What is a sponge's inner layer of cells made of? What do they do?

Choanocytes (collar cells)- move water through pores in sponges body

What is a sponge's outer layer of cells called?


What is the mesoglea?

The gelatinous, protein matrix between cell layers where amoebocytes "crawl around"

What is another word for mesoglea?


What are amoebocytes (pron. ameba-sites)? What do they do? What is special about them?

Mobile cells that make supportive fibers in the middle body region; store, digest, and transport food and nutrients to other cells of the body; produce materials for spicules; excrete wastes; and can change into any kind of cell the body needs, like sperm or egg by meiosis.

What is the spongocoel (pron. sponge-o-seal)?

The large open cavity inside the sponge body

What is the osculum?

The large opening at the top of the sponge where water exits the spongocoel

What are spicules? What do they do? What is unique about them?

Small, needle-like skeletal structures that provide structural support and deter predators. Sponges are the only animals with them.

Describe sponges' respiratory mechanism.


Describe sponges' nitrogen waste removal mechanism.


Describe sponges' circulatory mechanism.

None, except for what amoebocytes provide

Describe sponges' nervous mechanism.

No nervous control; some chemical

How do sponges move?

Some contractile fibers in epithelial cells

How do sponges maintain internal stability in marine and freshwater?

Marine- conformers

FW- contractile vacuoles

How do sponges reproduce?

Sexual: Sponges are hermaphroditic- each individual functions as both male and female by producing eggs and sperm.

Asexual: budding and breaking off- NOT to be confused with spawning