When the coelomic fluid serves as a skeleton it is known asa)Exoskelet...
Hydrostatic Skeleton
A hydrostatic skeleton is a skeleton formed by a fluid-filled compartment within the body, called the coelom. The organs of the coelom are supported by the aqueous fluid, which also resists external compression. This compartment is under hydrostatic pressure because of the fluid and supports the other organs of the organism. This type of skeletal system is found in soft-bodied animals such as sea anemones, earthworms, Cnidaria, and other invertebrates Movement in a hydrostatic skeleton is provided by muscles that surround the coelom. The muscles in a hydrostatic skeleton contract to change the shape of the coelom; the pressure of the fluid in the coelom produces movement. For example, earthworms move by waves of muscular contractions of the skeletal muscle of the body wall hydrostatic skeleton, called peristalsis, which alternately shorten and lengthen the body. Lengthening the body extends the anterior end of the organism. Most organisms have a mechanism to fix themselves in the substrate. Shortening the muscles then draws the posterior portion of the body forward. Although a hydrostatic skeleton is well-suited to invertebrate organisms such as earthworms and some aquatic organisms, it is not an efficient skeleton for terrestrial animals.
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When the coelomic fluid serves as a skeleton it is known asa)Exoskelet...
Choanocytes are also known as Collar Cells.
Explanation:
Choanocytes are specialized cells found in sponges. They are responsible for creating water flow through the sponge and capturing food particles from the water.
The name Choanocyte comes from the Greek word "choanos" which means funnel and "cyte" which means cell. Choanocytes are shaped like a funnel and have a central flagellum surrounded by a ring of microvilli (tiny hair-like projections).
The microvilli form a collar-like structure around the flagellum, hence the name "collar cells". The collar traps food particles and moves them towards the cell body where they are ingested and digested.
Choanocytes also play a role in gas exchange and waste removal in sponges. They are found in the inner layer of the sponge, known as the choanoderm, and are essential for maintaining the sponge's health and survival.
When the coelomic fluid serves as a skeleton it is known asa)Exoskelet...
Coelomic fluids serves as a skeleton in some insects called as hydrostatic skeleton that help in maintaining shape and size of thebody of organisms in absence of bone or cartilage.
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