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Sep 28, 2024 · Sponges accumulate silicon, calcium, and considerable quantities of metals. The spongins are iodine or bromine-containing scleroproteins similar to the keratin found in skin, claws, hair, and feathers of other animals. The two types of spongin, known as A and B, differ in composition and structure.
Sponges are multicellular organisms consisting of jelly-like mesohyl sandwiched between two thin layers of cells, and usually have tube-like bodies full of pores and channels that allow water to circulate through them.
A sponge endoskeleton consists of short, sharp rods called spicules (see Figure below). Spicules are made of silica, calcium carbonate, or spongin , a tough protein. They grow from specialized cells in the body of the sponge.
Sep 28, 2024 · Sponge - Anatomy, Filtering, Reproduction: Sponges are unusual animals that lack definite organs to carry out their various functions. The most important structure is the water-current system, which includes the pores (ostia), the choanocytes (collar cells), and the oscula.
A sponge is a member of the phylum Porifera. It is a simplest oldest multicellular animal, but no mouth, muscles, heart or brain. It is sessile filter feeder and locate in hard substrate permanently.
A sponge’s skeletal type adapts well to its particular habitat, allowing it to live on hard, rocky surfaces or soft sediments such as sand and mud. Some sponges even attach themselves to floating debris! Rarely are they found completely free-floating.
Sep 28, 2024 · Sponge, any of the primitive multicellular aquatic animals that constitute the phylum Porifera. They number approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of 8,500 metres (29,000 feet) or more.
