The animals of this phylum have tiny pores in their body walls and this characteristic feature is the basis of the name of this phylum. These formations are made of a sponge like tissue containing trabeculae irregular blood filled spaces lined by endothelium and separated by connective tissue septa.
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The two corpora cavernosa lie along the penis shaft from the pubic bones to the head of the penis where they join.
Sponge anatomy. The term porifera literally means pore bearers. Simple worksheet for labeling the parts of the sponge such as the osculum and choanocyte. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them consisting of jelly like mesohyl sandwiched between two thin layers of cells.
Compressed polygonal cells called pinacocytes make up the pinacoderm the external sac layer. In the gel layer are either spicules supportive needles made of calcium carbonate or spongin fibers a flexible skeletal material made from protein. Choanocytes in small chambers called choanocyte chambers original much that open to an apopyle leading to the spongocoel.
Simple sponges with choanocytes lining inner cavity radially symmetrical syconoid condition choanoderm and pinacoderm folding creates the shape. The flowing water also carries out waste products. A trivia quiz called sponge anatomy.
Wall of a sponge contains amoebocytes they are creeping mobile cells with a variety of functions including digestion and ability to differntiate into other cell types as needed. The body of a sponge has two outer layers separated by an acellular having no cells gel layer called the mesohyl also called the mesenchyme. Sponges contain no organs or even tissue.
Test your knowledge about sponge anatomy with this online quiz. Cells embedded in the sponge tissue that ppick up nutrients from the incoming water and distribute nutrients throughout the sponge. Sponges obtain nourishment and oxygen from this flowing water.
The cells in the outer layers can move inward and change function. The branch of zoology that studies sponges is known as spongiology. Instead they consist of three cell sized layers.
Porifera is a phylum comprising of the multi cellular invertebrate animals called sponges.
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