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The water expulsion vesicle (also known as a contractile vesicle) is an important osmoregulatory organelle in freshwater protists, which are hyperosmotic to surrounding water. Water constantly diffuses into cell and could cause the cell to burst if there wasn't some way to get it out. That is what water expulsion vesicle does. A network of collecting tubules extends throughout cells, and rich supply of mitochondria on the surface of tubules provides energy required to pump water from cytoplasm into the tubules. Tubules dump the water they've collected into water expulsion vesicle, which slowly fills. Once full, vesicle's membrane fuses with the outer plasma membrane creating a pore out of which excess water flows.
WHAT IS THE CLASSIFICATION OF PROTOZOA ..
parts involving in circulatory system
Complication during gestation Many complications like uterine torsion, vaginal prolapse, mummification, foetal maceration, hydra allantois, hydro amnios and teratological abno
main branches of biology
Explain the differences between a thrombus and an embolus. Include predisposing factors, mechanism of occurrence, treatment, and methods of detection with medical imaging, if any.
THEORY OF NATURAL SELECTION OR DARWINISM Theory of CharIes Darwin (1809 - 1882) about evolution marks the beginning of an era in understanding of evolution. At the age
Removal of obturating material -Gutta percha . -Carrier bassed gutta perca. -silver points . - paste type. - obstructed fracture instrument .
Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to ph
Syncytial Theory - Metazoa This theory suggests that the ancestral metazoan was at ,first Syncytial in structure but later became cellularised by formation of cell membranes
Why acquired traits are not directly related to the process of evolution? As acquired traits are not genetically determined, they cannot be passed on to offspring. Therefore,
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