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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.
Describe the Lymphatic Organs in human biology? The lymphatic organs include the lymph nodes, the spleen, the thymus gland, the tonsils, and Peyer's patches, all containing lym
PEROXISOMES AND GLYOXYSOMES Certain small ovoid unit membrane bound sac like cytoplasmic organelles, resembling lysosomes in size and appearance were isolated from var
Define Nutrition Support in elderly - Parenteral, Enteral and Oral? Under nutrition either due to dietary deficit a due to a medical complication may arise in the elderly. The
Define Briefly about the Copper? As early as the times of Hippocrates, copper compounds were used to treat various diseases. However, in the 20" century, it was noticed that an
Abscission - Effects of Plant Growth Regulators Abscission of leaves and fruit is one of the more obvious characteristics of senescence. Leaves do not fall simply because they
what is the latest classification of fungi
In biological studies which of the below terms is used to refer to muscles with less than normal tone? Is it: a) Latent b) Atonic c) Flaccid d) None of these ANSWE
Q. What is Alzheimer's disease? The Alzheimer's disease is a degenerative disease of the central nervous system in which the patient has progressive dementia and alteration of
Q. How execute the two complementary nucleotide chains of the DNA facilitate the replication process of the molecule? The fact that DNA molecule is made of two polynucleotide c
Explain Canning (temperature above 100° C) - method of food preservation? Canning is the process in which the foods are heated in hermetically sealed (airtight) jars or cans t
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