It is the most prominent part of the agreed working complex, in which it acts as a periodically empty tank. The liquid enters the contractive vacuole from the system of bubble or tubular vacuoles, called spongy. The operation of the complex allows you to maintain more or less permanent cell volume, compensating for a constant inflow of water through the plasma membrane caused by a high osmotic pressure of the cytoplasm.
The contracting vacuoles are common primarily among freshwater protists, but also marked by marine forms. Similar structures were found in the cells of freshwater sponges from the Badgykh family.
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Notes
Sources
- Hausmann K., Hülsmann N, Radek R. Protistology. - Berlin, Stuttgart, E. Schweizerbert'sche verlagbuchhandlung, 2003.
- Karpov S. A. The structure of the cells of the prostists: a training manual. - SPb.: Tessa, 2001. - 384 p. - Il.
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Excerpt characterizing contractive vacuum
- if he was accused of spreading Napoleon's proclamation, then it was not proven, "said Pierre (without looking at the damn), - and Vereshchagin ...- Nous Y Voila, [So,] - Suddenly frowning, interrupting Pierre, even louder than the former cried in cropping. - Vereshchagin, a traitor and a traitor who will receive a deserved execution, "said Mozchatchin with the heat of the evil, with whom people say when memories of insult. "But I did not call you in order to discuss my affairs, and in order to give you advice or order, if you want it." I ask you to stop intercourse with such gentlemen as Klyucharev, and go from here. And I am a fool, in whom it would be. - And, probably, having triggering that he seemed to be shouted on a mess, who had not yet to blame for anything, he added, friendly Pierre's hand: - Nous Sommes a La Veille D "Un Desastre Publique, Et Je N" AI Pas Le Temps De Dire Des Gentilleses a tous Ceux Qui Ond Affaire a Moi. Heart sometimes goes around! EH! Bien, Mon Cher, QU "EST CE QUE Vous Faites, Vous Personnellement? [We are on the eve of a common disaster, and I have no time to be kind with everyone, with whom I have a deal. So, the courtesy, what are you doing, you personally?]
- Mais Rien, [yes nothing,] - answered Pierre, all without lifting the eye and without changing the expressions of a thoughtful face.
It is the most prominent part of the agreed working complex, in which it acts as a periodically empty tank. The liquid enters the contractive vacuole from the system of bubble or tubular vacuoles, called spongy. The operation of the complex allows you to maintain more or less permanent cell volume, compensating for a constant inflow of water through the plasma membrane caused by a high osmotic pressure of the cytoplasm.
The contracting vacuoles are common primarily among freshwater protists, but also marked by marine forms. Similar structures were found in the cells of freshwater sponges from the Badgykh family.
Notes
Sources
- Hausmann K., Hülsmann N, Radek R. Protistology. - Berlin, Stuttgart, E. Schweizerbert'sche verlagbuchhandlung, 2003.
- Karpov S. A. The structure of the cells of the prostists: a training manual. - SPb.: Tessa, 2001. - 384 p. - Il.
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Watch what is "contracting vacuole" in other dictionaries:
Cutting vacuole, see Vacuol ... Scientific and Technical Encyclopedic Dictionary
Contractile Vacuole Cutting vacuole. Vacuolet tip in some groups of pretors involved in the removal of water (solutions) from the cell when cutting and in the absorption of water by the cell when expanding, which serves to regulate the osmotic pressure. ... ... Molecular biology and genetics. Dictionary.
The structure of the eukaryotic cell. Vacuol is indicated at number 10 Vacolating Single-dimmable organoid contained in some eukaryotic cells and ... Wikipedia
Or Heliozoa Sarkodic class detachment (see) Type of simplest (see) animals. Morphological properties. They are distinguished by a spherical protoplasmic body, from which in all directions, like the rays, are subtle, filamentous, not ... ... Encyclopedic Dictionary F.A. Brockhaus and I.A. Efron
Or CiliaTa is a squamor class, or infusories (see), such as simplest (see). Cilic infusories. I (Aspirotricha). The value of the letters: and the poroshire; Al Alveolar Extoplasma Layer; AD.Z adorable row of cilia; b tangible bristles; Clacks; ... Encyclopedic Dictionary F.A. Brockhaus and I.A. Efron
- (Lobosea), the class is the most simply organized by the simplest above the Cartoon Class. Lained internal. Skeleton and outdoor Sinks. The body shape is inconsistent, sizes are usually from 20 to 700 microns, less often somewhat more. The form and dimensions of the pseudopodies are characteristic of ... ... Biological Encyclopedic Dictionary
- (Flagellata s. Mastigophora, see Table. Bijachenians, Flagellata) The class of simplest animals (Protozoa). Like all other representatives of this type, they have a body consisting of only one cell representing protoplasm and a nucleus with a nuclear one. ... ... Encyclopedic Dictionary F.A. Brockhaus and I.A. Efron
Or protozoa. Contents of Article: Characteristics and Classification. Historical essay. Morphology; Protoplasm with inclusions (tricotics, core, contractile vacuoles, chromatophores, etc.). Covers and skeleton. Motion p.; pseudopodia, flagella and ... ... Encyclopedic Dictionary F.A. Brockhaus and I.A. Efron
Vacuoles are single-dimmable eukaryotic cell organides. At the same time, they contain not all eukarot cells.
The functions of vacuoles are diverse. Mostly reduced to secretion, storage of spares, autofhagia, autolis, maintaining tour pressure.
They are formed by the fusion of the proviculos, which form the EPS and the Golgi complex.
In animal cells there are small vacuoles: fazoSitosis, digestive and etc. Cutting vacuoles Regulate osmotic pressure, output of decay products. In plant cells usually there is one big central Vakolol..
Central Vakolol.
The central vacuole occupies more than half the volume of mature cells, especially in the parenchyma and collegum. The main functions are the supply of water, the accumulation of ions, maintaining the turgora.
Vacuole membrane is called tonoplast, and internal content - cell juice. It is a concentrated solution. Composition of cell juice: water, mineral salts, sugar, tannins, organic acids, oxygen, carbon dioxide, anthocyanine pigments, cellular metabolic products, etc.
The tonoplast is selectively permeable. Water comes through it in the vacuol. Tour pressure occurs, and the cytoplasm is pressed against the cell wall. Due to such osmotic absorption of water, the cell is stretched during growth.
The central vacuole may contain hydrolytic enzymes, which allows it to perform the function lysosomes. After the death of the cell, enzymes fall into the cytoplasm, and autolisis occurs.
In vacuoles, such life waste as calcium oxalate crystals are accumulated. Among the secondary products of metabolism are alkaloids, which allegedly perform a protective function along with tannins, preventing eating animals.
Some plants accumulate in cellular juice milky Juice, representing a whitish emulsion. A number of plants have cells that excrete it.
Nutrients (sucrose, inulin) are also reserved in central vacuoles, which are used if necessary, as the mineral salts contained here.
- Comfortable organ, where food is digested, is split into simple compounds that, after being absorbed by the body and are used for its needs. However, the tiny - the simplest and sponges - the stomach, of course, no. His role is played by the FAGOSOM, also called the digestive vacuum - bubble, membrane. It is formed around a solid particle or cell that the body decided to eat. There is a digestive vacuum and around the stressed drop of liquid. The phaginoma merges with lysosome, enzymes are activated and the process of digestion begins, which lasts about an hour. During the digestion of the medium inside the phageosoma varies with sour to alkaline. After all nutrients are extracted, unbearable food residues are derived from the body through the poroshire or cell membrane.
The digestion of solid food is called phagocytosis, liquid - pinocytosis.
Cutting vacuole
Many and some sponge representatives have a contractile vacuole. The main function of this organo is the regulation of osmotic pressure. Through the cell membrane, the water enters the cell of the sponge or simplest, and periodically at an equal interval of the time the liquid is derived from the use of a contractive vacuole, which, smashed to a certain point, then begins to shrink through the elastic beams existing in it.
There is a hypothesis that the contractile vacuum takes part in cellular breathing.
Vakol in the plant cage
Plants also have vacuoles. In a young cell, as a rule, there are several pieces of small size, but as the cells increase, they increase and merge into one large vacuole, which is capable of occupying 70-80% of the entire cell. The vegetable vacuol contains cellular juice, which includes minerals, sugar and organic matter. The main function of this organo is maintaining the turgora. Also, plant vacuoles are involved in the water-salt exchanging, splitting and assimilation of nutrients and disposal of compounds that can harm the cell. Green parts of plants, not coated wood, retain their shape due to a solid cell wall and vacuoles that support the shape of cells unchanged and do not allow deformation.
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