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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.
Define Surgery? Surgery ! Does the word itself not create a feeling of anxiety and bring our thoughts towards a debilitating state of health which would be accompanied by pain,
R i n g w o r m It is also known as dermatophytosis resulting in alopecia, scab formation and ring like lesions in the affected body parts. Eti o logy: Zeop
Periodicity (Phenology, Aspection) It refers to the study of seasonal changes in the community, that is, the periodic phenomena of organisms in relation to their climate. Peri
Define Natural Disasters - Public Nutrition? Disaster prone settings also shape the intensity and prevalence of food insecurity, these consist of poor who are exposed to recurr
Q What are the few representatives of the phylum Mollusca? Octopuses, Snails, oysters and squids are examples of molluscs. Q. In which habitats do molluscs live? Mollus
These mycotoxins are structurally and biologically related to the aflatoxins, and like the latter, they cause hepatocarcinogenic activity in animals. Among the organisms that prod
Animals of the littoral zone Animals of this zone may be herbivores, carnivores or detritus feeders and are as diverse as plants. Many of them such as rotifers, protozoans, i
Healing Events around Implants Healing of an implant is compared with the processes in normal bone healing or bone regeneration and with stable osteosynthesis.
An alternative approach has been to identify areas with the highest number of endemics or species with a restricted geographical range. Assessments of this nature have been very of
Eutrophication "Runaway" growth of the aquatic plants which takes place when agricultural fertilizers containing the phosphorus and nitrogen run off into lakes and ponds; also ult
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