POLIAN VESICLES Meaning and
Definition
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Polian vesicles are small, fluid-filled structures found in the water vascular system of certain marine invertebrates, specifically echinoderms. Polian vesicles are named after German zoologist Jakob Poliansky, who first discovered them in the 19th century. These vesicles play a crucial role in regulating the hydrostatic pressure and fluid balance of the water vascular system, which is responsible for various vital functions in echinoderms.
Polian vesicles are typically located near the ring canal, which surrounds the central disk of the water vascular system. They are connected to the radial canals and tube feet through a series of fine tubules. The vesicles themselves consist of a sac-like structure lined with a thin layer of cells, filled with a clear fluid.
The main function of Polian vesicles is to help maintain the proper pressure within the water vascular system. By actively regulating the fluid volume and composition, these vesicles play a role in regulating body shape, locomotion, respiration, and feeding in echinoderms. They can also function as temporary reservoirs of excess water and expelled waste products.
Furthermore, Polian vesicles are involved in the coordination and synchronization of tube feet movement. They help in initiating the extension or retraction of tube feet, enabling echinoderms to crawl, grasp objects, and feed. Overall, these small vesicles are essential for the proper functioning of the water vascular system in echinoderms and ensure the various physiological processes necessary for their survival.
Common Misspellings for POLIAN VESICLES
- Polian vesiclas
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- Polian vesicler
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- polia n vesicles
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- polian ves icles
- polian vesi cles
- polian vesic les
- polian vesicl es
- polian vesicle s
Etymology of POLIAN VESICLES
The term "Polian vesicles" is derived from the name of the Italian naturalist Lazzaro Spallanzani's contemporaries, Christian Poli. Christian Poli was an Italian physiologist who made significant contributions to the study of marine invertebrates, particularly in the field of comparative anatomy. In the late 18th century, Poli described the presence of small, sac-like structures in the digestive system of certain types of marine animals, with a specific focus on starfish and sea cucumbers. These structures were later dubbed "Polian vesicles" in his honor, to recognize his pioneering work in the field.
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