Dylan Jordan

Cellular, tissue, or organ/organ-system

Germ Layers

Sponges have none, 2, or 3 germ layers.


There is no segmentation at all in a sponge.

Digestive System

Sponges are sessile so they cannot pursue their food. Their bodies are covered with pores and canals all over and which water passes. The water moves in and out by the beating of flagella which are parts of coenocytes or collar cells. Cells in the sponges wall capture food that is brought in by the movement of the collar cells. The food is taken in by the process of phagocytosis and each individual cell digests the food.

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Circulatroy System

Sponges have no true circulatory system. But instead, water is circulated by the collar cells, the rate of which can be controlled. Dissolved gases enter and leave cells by diffusion.

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Respiratory System

  • The respiration of a sponge is quite strange.
  • Most sponges do not have a respiratory system but breathe through oxygen diffusion which allows oxygen to pass from the water into the body of the sponge to be used as nutrients.
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    Excretory system

    A sponge has carbon dioxide and other wastes removed as the water moves in and out through the pores.

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    A sponge reproduces by budding and also sexually.

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    A sponge is a hollow tube with many pores or openings. The skeleton is made of lime or silicon.

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