spindles biology definition
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spindle spindle. 1. a pin tapered at one end or both ends, or something with this shape. 2. the thin, tapering figure occurring during metaphase of cell division, composed of microtubules radiating from the centrioles and connecting to the chromosomes at their centromeres.
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What is the function of spindle fibers in mitosis? Spindle fibers move chromosomes to the center of the cell during metaphase of cell division and break the chromosomes apart during Anaphase.
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Kinetochores The suffix-chore is from the Greek word choros, meaning place. In mammals, when the spindle connects, 15-35 pole-to-chromosome microtubules ( kinetochore microtubules ) attach to each single kinetochore. But the number is smaller in many other organisms. In yeast only a single microtubule connects. Each normal chromatid has one and only one kinetochore. Like other biological structures, kinetochores are composed of protein.
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- during mitosis in animal centrioles are used for division to create spindle fibers to move and connect the chromosomes/chromatids. In plants the spindles are all r … eady in the cell and do not need to be produced so no centrioles are necessary.
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Definitions &Translations Princeton's WordNet (0.00 / 0 votes) Rate this definition: spindle (noun). (biology) tiny fibers that are seen in cell division; the fibers radiate from two poles and meet at the equator in the middle.chromosomes are distributed by spindles in mitosis and meiosis. spindle (noun).rinceton's WordNet (0.00 / 0 votes) Rate this definition: spindle (noun). (biology) tiny fibers that are seen in cell division; the fibers radiate from two poles and meet at the equator in the middle.
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Spindle Fibers Spindle Fibers. spindle fibers A collection of microtubules attached to a centromere during mitosis and meiosis that are responsible for the movement of the chromosomes to opposite poles. Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate.ome attach to one kinetochore of a dyad with those growing from the opposite centrosome binding to the other kinetochore of that dyad. Some bind to the arms of the chromosomes. Spindle fibers are made of microtubules. Microtubules are lengthened and shortened by the addition and loss of tubulin subunits.
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Kinetochore The kinetochore /kɪˈnɛtəkɔər/ is the protein structure on chromatids where the spindle fibers attach during cell division to pull sister chromatids apart. The kinetochore forms in eukaryotes, assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.he kinetochore forms in eukaryotes, assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.
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- Medical Definition of CENTRIOLE. : one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle. one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle — see cell illustration. See centriole defined for kids.
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Biology book1 These 10 animal facts will amaze you. The kinetochore is a structure in a cell’s nucleus that is involved in mitosis and meiosis, the two processes of cell division. Kinetochores are specialized regions located on the centromeres of chromosomes, and they are made up of many types of proteins.
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spindle A network of protein fibers that forms in the cytoplasm of a cell during cell division. The spindle grows forth from the centrosomes and attaches to the chromosomes after the latter have been duplicated, and the nuclear membrane dissolves. Once attached, the spindle fibers contract, pulling the duplicate chromosomes apart to opposite poles of the dividing cell. See more at meiosis, mitosis.
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- The mitotic spindle is a structure composed of microtubules which segregates chromosomes into the daughter cells during mitosis. A microtubule is a rope-like component of the cytoskeleton.The centrosome is an organelle that serves as a microtubule organizing center during cell division.he centrosome is an organelle that serves as a microtubule organizing center during division. It's duplicated during S phase, and the two copies move to opposite sides of the cell. Now, once the mitotic spindle has been assembled, the centrosomes are also referred to as spindle poles.
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Definition Definition. Muscle spindles are skeletal muscle sensory organs that contribute to fine motor control and provide axial and limb position information to the central nervous system. They are involved in the sensation of position and movement of the body, this is called proprioception.uscle spindles are small sensory organs, with an elongated shape. A muscle spindle contains intrafusal fibers. Those are several small, specialized muscle fibers. Those fibers are oriented parallel to the regular, power-producing extrafusal muscle fibers.
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centromere (sěn'trə-mîr') The region of the chromosome to which the spindle fiber is attached during cell division (both mitosis and meiosis). The centromere is the constricted point at which the two chromatids forming the chromosome are joined together. See more at meiosis, mitosis.
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Mitotic spindle It is referred to as the mitotic spindle during mitosis , a process that produces genetically identical daughter cells, or the meiotic spindle during meiosis , a process that produces gametes with half the number of chromosomes of the parent cell. Besides chromosomes, the spindle apparatus is composed of hundreds of proteins .
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Muscle Spindle In conclusion, the muscle spindle is a very important proprioceptor located in the muscle belly. Through both type 1a afferents, type 11 afferents, and gamma efferents the muscle spindle provides the central nervous system with information needed for motor control, postural control, and muscle tone.
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- Medical Definition of CENTRIOLE. : one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle. one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle.
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- The mitotic spindle is the macromolecular machine that segregates chromosomes to two daughter cells during mitosis. The major structural elements of the spindle are microtubule polymers, whose intrinsic polarity and dynamic properties are critical for bipolar spindle organization and function.he mitotic spindle is the macromolecular machine that segregates chromosomes to two daughter cells during mitosis. The major structural elements of the spindle are microtubule polymers, whose intrinsic polarity and dynamic properties are critical for bipolar spindle organization and function.
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- Spindle fibers consist of fibers made of microtubules and associated proteins. While the mitotic spindle assembles, the other microtubules of the cytoskeleton partially disass … emble, probably providing the material used to construct the spindle.pindle fibers shorten during anaphase I and anaphase II in meiosis in order for both the separation of the homologous chromosomes and the sister chromatids to opposite poles … before telophase I and II.
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Cracking (chemistry) Fluid catalytic cracking produces a high yield of petrol and LPG, while hydrocracking is a major source of jet fuel, Diesel fuel, naphtha, and again yields LPG.Refinery using the Shukhov cracking process, Baku, Soviet Union, 1934.luid catalytic cracking produces a high yield of petrol and LPG, while hydrocracking is a major source of jet fuel, Diesel fuel, naphtha, and again yields LPG. Refinery using the Shukhov cracking process, Baku, Soviet Union, 1934.
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- Spindles extend from centrioles on each of the two sides (or poles) of the cell, attach to the chromosomes and align them, and pull the sister chromatids apart. Chromosomes are usually visible under light microscope. We can determine the number of chromosomes [and chromatid (s) per chromosome] for each stage in mitosis. Prophase. Chromatin in the nucleus begins to condense and becomes visible under the light microscope as chromosomes, each with two chromatids that are held together at the centromere.
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Muscle spindle Mammalian muscle spindle showing typical position in a muscle (left), neuronal connections in spinal cord (middle) and expanded schematic (right). The spindle is a stretch receptor with its own motor supply consisting of several intrafusal muscle fibres.
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DIFFERENT TYPES OF ANIMAL CELLS AND THEIR FUNCTIONS Cells Vocabulary List & Definitions Centrosome (microtubule organizing center) A small body located near the nucleus-it has a dense center and radiating tubules. The centrosome is where microtubules are made.
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- The noun SPINDLE has 3 senses: 1. (biology) tiny fibers that are seen in cell division; the fibers radiate from two poles and meet at the equator in the middle. 2. any of various rotating shafts that serve as axes for larger rotating parts. 3. a stick or pin used to twist the yarn in spinning.. (biology) tiny fibers that are seen in cell division; the fibers radiate from two poles and meet at the equator in the middle. 2. any of various rotating shafts that serve as axes for larger rotating parts.
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- Report Abuse. Spindle fibres drag the chromosomes and then pull them to the respective poles and in this way serve in movement of the the chromosome. In other words they provided the directionality to the dividing cells. Ishan26 · 8 years ago.
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- Medical Definition of CENTRIOLE. : one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle.edical Definition of CENTRIOLE. : one of a pair of cellular organelles that occur especially in animals, are adjacent to the nucleus, function in the formation of the spindle apparatus during cell division, and consist of a cylinder with nine microtubules arranged peripherally in a circle.
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- spindle fibers A collection of microtubules attached to a centromere during mitosis and meiosis that are responsible for the movement of the chromosomes to opposite poles. Spindle fibers align the chromosomes along the middle of the cell nucleus. The protein fibers formed during prophase of nuclear division; chromosomes attach to these fibers at the centromere. spindle The aggregation of microtubules that is involved in the movement and separation of chromosomes during mitosis and meiosis.